import java.util.Scanner;

class Main {

  public static void main(String[] args) {
    new Main().run();
  }

  private Scanner sc = new Scanner(System.in);

  private void run() {
    String S = sc.next();
    if (S.contains("A") && S.contains("B")) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} import java.util.Scanner; Scanner java.util class Main {

  public static void main(String[] args) {
    new Main().run();
  }

  private Scanner sc = new Scanner(System.in);

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

class Main {

  public static void main(String[] args) {
    new Main().run();
  }

  private Scanner sc = new Scanner(System.in);

  private void run() {
    String S = sc.next();
    if (S.contains("A") && S.contains("B")) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
}
