
import java.util.Scanner;


public class Main{
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		String S = sc.next();

		if (S.matches (".*A.*") && S.matches (".*B.*") ){
				System.out.print("Yes");
		}else {
		System.out.print("No");
		}

	}
}


 import java.util.Scanner; Scanner java.util public class Main{
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		String S = sc.next();

		if (S.matches (".*A.*") && S.matches (".*B.*") ){
				System.out.print("Yes");
		}else {
		System.out.print("No");
		}

	}
} Main public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		String S = sc.next();

		if (S.matches (".*A.*") && S.matches (".*B.*") ){
				System.out.print("Yes");
		}else {
		System.out.print("No");
		}

	} main {

		Scanner sc = new Scanner(System.in);

		String S = sc.next();

		if (S.matches (".*A.*") && S.matches (".*B.*") ){
				System.out.print("Yes");
		}else {
		System.out.print("No");
		}

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc if (S.matches (".*A.*") && S.matches (".*B.*") ){
				System.out.print("Yes");
		}else {
		System.out.print("No");
		} S.matches (".*A.*") && S.matches (".*B.*") S.matches (".*A.*") S.matches S ".*A.*" S.matches (".*B.*") S.matches S ".*B.*" {
				System.out.print("Yes");
		} System.out.print("Yes") System.out.print System.out System System.out "Yes" {
		System.out.print("No");
		} System.out.print("No") System.out.print System.out System System.out "No" String[] args args public class Main{
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		String S = sc.next();

		if (S.matches (".*A.*") && S.matches (".*B.*") ){
				System.out.print("Yes");
		}else {
		System.out.print("No");
		}

	}
} public class Main{
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		String S = sc.next();

		if (S.matches (".*A.*") && S.matches (".*B.*") ){
				System.out.print("Yes");
		}else {
		System.out.print("No");
		}

	}
} Main

import java.util.Scanner;


public class Main{
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		String S = sc.next();

		if (S.matches (".*A.*") && S.matches (".*B.*") ){
				System.out.print("Yes");
		}else {
		System.out.print("No");
		}

	}
}



