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

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String S = br.readLine();
		char[] ch = S.toCharArray();
		
		if(ch[0] == ch[1] && ch[1] == ch[2])
			System.out.println("No");
		else
			System.out.println("Yes");
	}

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

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String S = br.readLine();
		char[] ch = S.toCharArray();
		
		if(ch[0] == ch[1] && ch[1] == ch[2])
			System.out.println("No");
		else
			System.out.println("Yes");
	}

} Main public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String S = br.readLine();
		char[] ch = S.toCharArray();
		
		if(ch[0] == ch[1] && ch[1] == ch[2])
			System.out.println("No");
		else
			System.out.println("Yes");
	} main {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String S = br.readLine();
		char[] ch = S.toCharArray();
		
		if(ch[0] == ch[1] && ch[1] == ch[2])
			System.out.println("No");
		else
			System.out.println("Yes");
	} BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String S = br.readLine(); S br.readLine() br.readLine br char[] ch = S.toCharArray(); ch S.toCharArray() S.toCharArray S if(ch[0] == ch[1] && ch[1] == ch[2])
			System.out.println("No");
		else
			System.out.println("Yes"); ch[0] == ch[1] && ch[1] == ch[2] ch[0] == ch[1] ch[0] ch 0 ch[1] ch 1 ch[1] == ch[2] ch[1] ch 1 ch[2] ch 2 System.out.println("No") System.out.println System.out System System.out "No" System.out.println("Yes") System.out.println System.out System System.out "Yes" String[] args args public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String S = br.readLine();
		char[] ch = S.toCharArray();
		
		if(ch[0] == ch[1] && ch[1] == ch[2])
			System.out.println("No");
		else
			System.out.println("Yes");
	}

} public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String S = br.readLine();
		char[] ch = S.toCharArray();
		
		if(ch[0] == ch[1] && ch[1] == ch[2])
			System.out.println("No");
		else
			System.out.println("Yes");
	}

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

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String S = br.readLine();
		char[] ch = S.toCharArray();
		
		if(ch[0] == ch[1] && ch[1] == ch[2])
			System.out.println("No");
		else
			System.out.println("Yes");
	}

}