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