import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      
      String S1 = "AAA";
      String S2 = "BBB";
      
      if(S.equals(S1)){
      System.out.println("No");
      }
      else if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      }
    }
} 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();
      
      
      String S1 = "AAA";
      String S2 = "BBB";
      
      if(S.equals(S1)){
      System.out.println("No");
      }
      else if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      }
    }
} Main public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      
      String S1 = "AAA";
      String S2 = "BBB";
      
      if(S.equals(S1)){
      System.out.println("No");
      }
      else if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      }
    } main {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      
      String S1 = "AAA";
      String S2 = "BBB";
      
      if(S.equals(S1)){
      System.out.println("No");
      }
      else if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc String S1 = "AAA"; S1 "AAA" String S2 = "BBB"; S2 "BBB" if(S.equals(S1)){
      System.out.println("No");
      }
      else if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      } S.equals(S1) S.equals S S1 {
      System.out.println("No");
      } System.out.println("No") System.out.println System.out System System.out "No" if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      } S.equals(S2) S.equals S S2 {
      System.out.println("No");
      } System.out.println("No") System.out.println System.out System System.out "No" {
        System.out.println("Yes");
      } System.out.println("Yes") System.out.println System.out System System.out "Yes" String[] args args public class Main {
	public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      
      String S1 = "AAA";
      String S2 = "BBB";
      
      if(S.equals(S1)){
      System.out.println("No");
      }
      else if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      }
    }
} public class Main {
	public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      
      String S1 = "AAA";
      String S2 = "BBB";
      
      if(S.equals(S1)){
      System.out.println("No");
      }
      else if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      }
    }
} Main
import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      
      String S1 = "AAA";
      String S2 = "BBB";
      
      if(S.equals(S1)){
      System.out.println("No");
      }
      else if(S.equals(S2)){
      System.out.println("No");
      }
      else{
        System.out.println("Yes");
      }
    }
}