import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		String total = scanner.nextLine();
		if (total.contains("A") && total.contains("B")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}	
	
	

} import java.util.Scanner; Scanner java.util public class Main {
	
	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		String total = scanner.nextLine();
		if (total.contains("A") && total.contains("B")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}	
	
	

} Main public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		String total = scanner.nextLine();
		if (total.contains("A") && total.contains("B")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	} main {
		
		Scanner scanner = new Scanner(System.in);
		String total = scanner.nextLine();
		if (total.contains("A") && total.contains("B")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	} Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) String total = scanner.nextLine(); total scanner.nextLine() scanner.nextLine scanner if (total.contains("A") && total.contains("B")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} total.contains("A") && total.contains("B") total.contains("A") total.contains total "A" total.contains("B") total.contains total "B" {
			System.out.println("Yes");
		} System.out.println("Yes") System.out.println System.out System System.out "Yes" {
			System.out.println("No");
		} System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {
	
	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		String total = scanner.nextLine();
		if (total.contains("A") && total.contains("B")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}	
	
	

} public class Main {
	
	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		String total = scanner.nextLine();
		if (total.contains("A") && total.contains("B")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}	
	
	

} Main
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		String total = scanner.nextLine();
		if (total.contains("A") && total.contains("B")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}	
	
	

}