                ////////////////////////////////////////////////////
                //                                                //
                //  For her who keeps the fire kindling in me...  //
                //                                                //
                ////////////////////////////////////////////////////


import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException; 
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
// import java.util.Scanner;
// import java.util.Arrays;
// import java.util.ArrayList;
// import java.util.Collections; 
// import java.util.StringTokenizer;
import java.util.*;
import java.lang.Math;
import java.awt.Point;                            

import java.awt.geom.*;

public class Main{

    static class Pair{
        int x;
        int y;
    }

    public static void main(String args[]){
        try{
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}
                
                
//========================================### FAST IO ###=========================================//
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(); 
    } 

    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;
    } 
}
    //====================================================================================================// import java.io.BufferedReader; BufferedReader java.io import java.io.BufferedWriter; BufferedWriter java.io import java.io.FileOutputStream; FileOutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.OutputStream; OutputStream java.io import java.io.OutputStreamWriter; OutputStreamWriter java.io import java.io.PrintWriter; PrintWriter java.io import java.util.*; util.* java import java.lang.Math; Math java.lang import java.awt.Point; Point java.awt import java.awt.geom.*; geom.* java.awt public class Main{

    static class Pair{
        int x;
        int y;
    }

    public static void main(String args[]){
        try{
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
} Main public static void main(String args[]){
        try{
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    } main {
        try{
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    } try{
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        }catch(Exception e){
            e.printStackTrace();
        } catch(Exception e){
            e.printStackTrace();
        } Exception e {
            e.printStackTrace();
        } e.printStackTrace() e.printStackTrace e {
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        } FastReader s = new FastReader(); s new FastReader() BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out)); w new BufferedWriter(new OutputStreamWriter(System.out)) int i i j j k k x x y y t t n n m m l l fo fo so so ev ev r r a a b b count count key key size size Pairer Pairer minglob minglob minloc minloc beg beg ec ec oc oc end end begl begl endr endr ld ld up up down down maxele maxele minele; minele long ans ans sqrt sqrt q q sum sum maxup maxup maxdown maxdown X X Y Y Q Q MOD; MOD boolean flag flag flag2; flag2 double avg; avg String str; str str = s.nextLine() str s.nextLine() s.nextLine s if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n"); str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2) str.charAt(0) == str.charAt(1) str.charAt(0) str.charAt str 0 str.charAt(1) str.charAt str 1 str.charAt(1) == str.charAt(2) str.charAt(1) str.charAt str 1 str.charAt(2) str.charAt str 2 {
                    w.write("No\n");
                } w.write("No\n") w.write w "No\n" w.write("Yes\n") w.write w "Yes\n" w.close() w.close w String args[] args static class Pair{
        int x;
        int y;
    } Pair int x; x int y; y 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(); 
    } 

    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;
    } 
} 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 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 public class Main{

    static class Pair{
        int x;
        int y;
    }

    public static void main(String args[]){
        try{
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
} public class Main{

    static class Pair{
        int x;
        int y;
    }

    public static void main(String args[]){
        try{
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
} Main
                ////////////////////////////////////////////////////
                //                                                //
                //  For her who keeps the fire kindling in me...  //
                //                                                //
                ////////////////////////////////////////////////////


import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException; 
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
// import java.util.Scanner;
// import java.util.Arrays;
// import java.util.ArrayList;
// import java.util.Collections; 
// import java.util.StringTokenizer;
import java.util.*;
import java.lang.Math;
import java.awt.Point;                            

import java.awt.geom.*;

public class Main{

    static class Pair{
        int x;
        int y;
    }

    public static void main(String args[]){
        try{
            FastReader s = new FastReader();
            BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));
            int i, j, k, x, y, t, n, m, l, fo, so, ev, r, a, b, count, key, size, Pairer, minglob, minloc, beg, ec, oc, end, begl, endr, ld, up, down, maxele, minele;
            long ans, sqrt, q, sum, maxup, maxdown, X, Y, Q, MOD;//, sum2;
            boolean flag, flag2;

            double avg;

             // t = s.nextInt();

              //for(; t>0; t--){

                // n = s.nextInt();

                // int arr[] = new int[n];

                // flag = false;   flag2 = false;
                // ev = -1;    fo = -1; sp = -1; ec=0; oc = 0;
                // for(i=0; i<n; i++){
                //     x = s.nextInt();
                //     if(x%2==0  && ev != -1){
                //         ev = x;
                //         ec++;
                //     }else if(x%2 == 1){
                //         if(fo == -1)
                //             fp = x;
                //         else
                //             so = x;

                //         oc++;
                //     }
                // }o

                String str;
                str = s.nextLine();

                if(str.charAt(0) == str.charAt(1)  &&  str.charAt(1) == str.charAt(2)){
                    w.write("No\n");
                }else
                    w.write("Yes\n");

                

                
            
              //}
            w.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}
                
                
//========================================### FAST IO ###=========================================//
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(); 
    } 

    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;
    } 
}
    //====================================================================================================//