import java.util.*;
import java.lang.*;
public class Main {
        public static void main (String[]args){
            Scanner scanner = new Scanner(System.in);
            String input = scanner.next();
            boolean path=false;
            for (int i=0;i<input.length()-1;i++){
                if(input.charAt(i)!=input.charAt(i+1)){
                    path=true;
                    break;
                }
            }
            System.out.println(path ? "Yes":"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