import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;


/*
* Problem : Count Balls
* Acknowledgement : None
* Author : deathnaught_
* GitHub : www.github.com/DeathNaughT-GitHub
* Complexity : O(1)
*/

public class Main
{

    public static void main(String[] args) 
    {
        FastReader sc = new FastReader();

        String s = sc.next();
      	int count = 0;
      	for (int i = 0; i < 3; i++) {
          if (s.charAt(i) == 'B')
            count++;
        }
      	if (count == 0 || count == 3) {
          System.out.println("No");
          return;
        } 
        System.out.println("Yes");
    }

    static class FastReader 
    { 

        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 

		boolean hasNext()
		{
		    return st == null ? false : true;
		}

        char nextChar()
        {
            return next().charAt(0);
        }
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 

        int[] nextArray(int rows)
        {
            int arr[] = new int[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextInt();
            return arr;
        }

        long[] nextLongArray(int rows)
        {
            long arr[] = new long[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextLong();
            return arr;
        }

        char[] nextCharArray(int rows)
        {
            char arr[] = new char[rows];
            for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0);
            return arr;
        }

        int[][] nextMatrix(int rows, int columns)
        {
            int mat[][] = new int[rows][columns];
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            }
            return mat;
        }
    } 

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main
{

    public static void main(String[] args) 
    {
        FastReader sc = new FastReader();

        String s = sc.next();
      	int count = 0;
      	for (int i = 0; i < 3; i++) {
          if (s.charAt(i) == 'B')
            count++;
        }
      	if (count == 0 || count == 3) {
          System.out.println("No");
          return;
        } 
        System.out.println("Yes");
    }

    static class FastReader 
    { 

        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 

		boolean hasNext()
		{
		    return st == null ? false : true;
		}

        char nextChar()
        {
            return next().charAt(0);
        }
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 

        int[] nextArray(int rows)
        {
            int arr[] = new int[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextInt();
            return arr;
        }

        long[] nextLongArray(int rows)
        {
            long arr[] = new long[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextLong();
            return arr;
        }

        char[] nextCharArray(int rows)
        {
            char arr[] = new char[rows];
            for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0);
            return arr;
        }

        int[][] nextMatrix(int rows, int columns)
        {
            int mat[][] = new int[rows][columns];
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            }
            return mat;
        }
    } 

} Main public static void main(String[] args) 
    {
        FastReader sc = new FastReader();

        String s = sc.next();
      	int count = 0;
      	for (int i = 0; i < 3; i++) {
          if (s.charAt(i) == 'B')
            count++;
        }
      	if (count == 0 || count == 3) {
          System.out.println("No");
          return;
        } 
        System.out.println("Yes");
    } main {
        FastReader sc = new FastReader();

        String s = sc.next();
      	int count = 0;
      	for (int i = 0; i < 3; i++) {
          if (s.charAt(i) == 'B')
            count++;
        }
      	if (count == 0 || count == 3) {
          System.out.println("No");
          return;
        } 
        System.out.println("Yes");
    } FastReader sc = new FastReader(); sc new FastReader() String s = sc.next(); s sc.next() sc.next sc int count = 0; count 0 for (int i = 0; i < 3; i++) {
          if (s.charAt(i) == 'B')
            count++;
        } int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
          if (s.charAt(i) == 'B')
            count++;
        } {
          if (s.charAt(i) == 'B')
            count++;
        } if (s.charAt(i) == 'B')
            count++; s.charAt(i) == 'B' s.charAt(i) s.charAt s i 'B' count++ count if (count == 0 || count == 3) {
          System.out.println("No");
          return;
        } count == 0 || count == 3 count == 0 count 0 count == 3 count 3 {
          System.out.println("No");
          return;
        } System.out.println("No") System.out.println System.out System System.out "No" return; System.out.println("Yes") System.out.println System.out System System.out "Yes" String[] args args static class FastReader 
    { 

        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 

		boolean hasNext()
		{
		    return st == null ? false : true;
		}

        char nextChar()
        {
            return next().charAt(0);
        }
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 

        int[] nextArray(int rows)
        {
            int arr[] = new int[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextInt();
            return arr;
        }

        long[] nextLongArray(int rows)
        {
            long arr[] = new long[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextLong();
            return arr;
        }

        char[] nextCharArray(int rows)
        {
            char arr[] = new char[rows];
            for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0);
            return arr;
        }

        int[][] nextMatrix(int rows, int columns)
        {
            int mat[][] = new int[rows][columns];
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            }
            return mat;
        }
    } FastReader BufferedReader br; br StringTokenizer st; st public FastReader() 
        { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } FastReader { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } next { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } IOException  e { 
                    e.printStackTrace(); 
                } e.printStackTrace() e.printStackTrace e { 
                    st = new StringTokenizer(br.readLine()); 
                } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st boolean hasNext()
		{
		    return st == null ? false : true;
		} hasNext {
		    return st == null ? false : true;
		} return st == null ? false : true; st == null ? false : true st == null st null false true char nextChar()
        {
            return next().charAt(0);
        } nextChar {
            return next().charAt(0);
        } return next().charAt(0); next().charAt(0) next().charAt next() next 0 int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } nextInt { 
            return Integer.parseInt(next()); 
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() 
        { 
            return Long.parseLong(next()); 
        } nextLong { 
            return Long.parseLong(next()); 
        } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } nextDouble { 
            return Double.parseDouble(next()); 
        } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } nextLine { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } String str = ""; str "" try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } catch (IOException e) 
            { 
                e.printStackTrace(); 
            } IOException e { 
                e.printStackTrace(); 
            } e.printStackTrace() e.printStackTrace e { 
                str = br.readLine(); 
            } str = br.readLine() str br.readLine() br.readLine br return str; str int[] nextArray(int rows)
        {
            int arr[] = new int[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextInt();
            return arr;
        } nextArray {
            int arr[] = new int[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextInt();
            return arr;
        } int arr[] = new int[rows]; arr new int[rows] rows for (int i = 0; i < rows; i++)
            arr[i] = nextInt(); int i = 0; int i = 0; i 0 i < rows i rows i++ i++ i arr[i] = nextInt(); arr[i] = nextInt() arr[i] arr i nextInt() nextInt return arr; arr int rows rows long[] nextLongArray(int rows)
        {
            long arr[] = new long[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextLong();
            return arr;
        } nextLongArray {
            long arr[] = new long[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextLong();
            return arr;
        } long arr[] = new long[rows]; arr new long[rows] rows for (int i = 0; i < rows; i++)
            arr[i] = nextLong(); int i = 0; int i = 0; i 0 i < rows i rows i++ i++ i arr[i] = nextLong(); arr[i] = nextLong() arr[i] arr i nextLong() nextLong return arr; arr int rows rows char[] nextCharArray(int rows)
        {
            char arr[] = new char[rows];
            for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0);
            return arr;
        } nextCharArray {
            char arr[] = new char[rows];
            for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0);
            return arr;
        } char arr[] = new char[rows]; arr new char[rows] rows for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0); int i = 0; int i = 0; i 0 i < rows i rows i++ i++ i arr[i] = next().charAt(0); arr[i] = next().charAt(0) arr[i] arr i next().charAt(0) next().charAt next() next 0 return arr; arr int rows rows int[][] nextMatrix(int rows, int columns)
        {
            int mat[][] = new int[rows][columns];
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            }
            return mat;
        } nextMatrix {
            int mat[][] = new int[rows][columns];
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            }
            return mat;
        } int mat[][] = new int[rows][columns]; mat new int[rows][columns] rows columns for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            } int i = 0; int i = 0; i 0 i < rows i rows i++ i++ i {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            } {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            } for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                } int j = 0; int j = 0; j 0 j < columns j columns j++ j++ j {
                    mat[i][j] = nextInt();
                } {
                    mat[i][j] = nextInt();
                } mat[i][j] = nextInt() mat[i][j] mat[i] mat i j nextInt() nextInt return mat; mat int rows rows int columns columns public class Main
{

    public static void main(String[] args) 
    {
        FastReader sc = new FastReader();

        String s = sc.next();
      	int count = 0;
      	for (int i = 0; i < 3; i++) {
          if (s.charAt(i) == 'B')
            count++;
        }
      	if (count == 0 || count == 3) {
          System.out.println("No");
          return;
        } 
        System.out.println("Yes");
    }

    static class FastReader 
    { 

        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 

		boolean hasNext()
		{
		    return st == null ? false : true;
		}

        char nextChar()
        {
            return next().charAt(0);
        }
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 

        int[] nextArray(int rows)
        {
            int arr[] = new int[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextInt();
            return arr;
        }

        long[] nextLongArray(int rows)
        {
            long arr[] = new long[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextLong();
            return arr;
        }

        char[] nextCharArray(int rows)
        {
            char arr[] = new char[rows];
            for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0);
            return arr;
        }

        int[][] nextMatrix(int rows, int columns)
        {
            int mat[][] = new int[rows][columns];
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            }
            return mat;
        }
    } 

} public class Main
{

    public static void main(String[] args) 
    {
        FastReader sc = new FastReader();

        String s = sc.next();
      	int count = 0;
      	for (int i = 0; i < 3; i++) {
          if (s.charAt(i) == 'B')
            count++;
        }
      	if (count == 0 || count == 3) {
          System.out.println("No");
          return;
        } 
        System.out.println("Yes");
    }

    static class FastReader 
    { 

        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 

		boolean hasNext()
		{
		    return st == null ? false : true;
		}

        char nextChar()
        {
            return next().charAt(0);
        }
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 

        int[] nextArray(int rows)
        {
            int arr[] = new int[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextInt();
            return arr;
        }

        long[] nextLongArray(int rows)
        {
            long arr[] = new long[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextLong();
            return arr;
        }

        char[] nextCharArray(int rows)
        {
            char arr[] = new char[rows];
            for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0);
            return arr;
        }

        int[][] nextMatrix(int rows, int columns)
        {
            int mat[][] = new int[rows][columns];
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            }
            return mat;
        }
    } 

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;


/*
* Problem : Count Balls
* Acknowledgement : None
* Author : deathnaught_
* GitHub : www.github.com/DeathNaughT-GitHub
* Complexity : O(1)
*/

public class Main
{

    public static void main(String[] args) 
    {
        FastReader sc = new FastReader();

        String s = sc.next();
      	int count = 0;
      	for (int i = 0; i < 3; i++) {
          if (s.charAt(i) == 'B')
            count++;
        }
      	if (count == 0 || count == 3) {
          System.out.println("No");
          return;
        } 
        System.out.println("Yes");
    }

    static class FastReader 
    { 

        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 

		boolean hasNext()
		{
		    return st == null ? false : true;
		}

        char nextChar()
        {
            return next().charAt(0);
        }
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 

        int[] nextArray(int rows)
        {
            int arr[] = new int[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextInt();
            return arr;
        }

        long[] nextLongArray(int rows)
        {
            long arr[] = new long[rows];            
            for (int i = 0; i < rows; i++)
            arr[i] = nextLong();
            return arr;
        }

        char[] nextCharArray(int rows)
        {
            char arr[] = new char[rows];
            for (int i = 0; i < rows; i++)
            arr[i] = next().charAt(0);
            return arr;
        }

        int[][] nextMatrix(int rows, int columns)
        {
            int mat[][] = new int[rows][columns];
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    mat[i][j] = nextInt();
                }
            }
            return mat;
        }
    } 

}