
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");
		}

	}
}




/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz