import java.util.*;

public class Main{
  public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    String s=sc.next();
    if (s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B') {
      System.out.println("No");
    }else{
      System.out.println("Yes");
    }
  }
} 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.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B') {
      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();
    if (s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B') {
      System.out.println("No");
    }else{
      System.out.println("Yes");
    }
  } main {
    Scanner sc=new Scanner(System.in);
    String s=sc.next();
    if (s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B') {
      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 if (s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B') {
      System.out.println("No");
    }else{
      System.out.println("Yes");
    } s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B' s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A' s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A' s.charAt(0)=='A' s.charAt(0) s.charAt s 0 'A' s.charAt(1)=='A' s.charAt(1) s.charAt s 1 'A' s.charAt(2)=='A' s.charAt(2) s.charAt s 2 'A' s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B' s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B' s.charAt(0)=='B' s.charAt(0) s.charAt s 0 'B' s.charAt(1)=='B' s.charAt(1) s.charAt s 1 'B' s.charAt(2)=='B' s.charAt(2) s.charAt s 2 'B' {
      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();
    if (s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B') {
      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();
    if (s.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B') {
      System.out.println("No");
    }else{
      System.out.println("Yes");
    }
  }
} 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.charAt(0)=='A'&&s.charAt(1)=='A'&&s.charAt(2)=='A'||s.charAt(0)=='B'&&s.charAt(1)=='B'&&s.charAt(2)=='B') {
      System.out.println("No");
    }else{
      System.out.println("Yes");
    }
  }
}
