import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    scan.close();

    if(!S.contains("A") || !S.contains("B")) {
      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 scan = new Scanner(System.in);
    String S = scan.next();
    scan.close();

    if(!S.contains("A") || !S.contains("B")) {
      System.out.println("No");
    }
    else {
      System.out.println("Yes");
    }
  }
} Main public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    scan.close();

    if(!S.contains("A") || !S.contains("B")) {
      System.out.println("No");
    }
    else {
      System.out.println("Yes");
    }
  } main {
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    scan.close();

    if(!S.contains("A") || !S.contains("B")) {
      System.out.println("No");
    }
    else {
      System.out.println("Yes");
    }
  } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String S = scan.next(); S scan.next() scan.next scan scan.close() scan.close scan if(!S.contains("A") || !S.contains("B")) {
      System.out.println("No");
    }
    else {
      System.out.println("Yes");
    } !S.contains("A") || !S.contains("B") !S.contains("A") S.contains("A") S.contains S "A" !S.contains("B") S.contains("B") S.contains S "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 scan = new Scanner(System.in);
    String S = scan.next();
    scan.close();

    if(!S.contains("A") || !S.contains("B")) {
      System.out.println("No");
    }
    else {
      System.out.println("Yes");
    }
  }
} public class Main {
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    scan.close();

    if(!S.contains("A") || !S.contains("B")) {
      System.out.println("No");
    }
    else {
      System.out.println("Yes");
    }
  }
} Main
import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    scan.close();

    if(!S.contains("A") || !S.contains("B")) {
      System.out.println("No");
    }
    else {
      System.out.println("Yes");
    }
  }
}