import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		String S = sc.nextLine();

		if((S.contains("A") == true) && (S.contains("B") == true))  {
			System.out.print("Yes");

		}else {
			System.out.print("No");

		}
	}

} 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.nextLine();

		if((S.contains("A") == true) && (S.contains("B") == true))  {
			System.out.print("Yes");

		}else {
			System.out.print("No");

		}
	}

} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		String S = sc.nextLine();

		if((S.contains("A") == true) && (S.contains("B") == true))  {
			System.out.print("Yes");

		}else {
			System.out.print("No");

		}
	} main {

		Scanner sc = new Scanner(System.in);

		String S = sc.nextLine();

		if((S.contains("A") == true) && (S.contains("B") == true))  {
			System.out.print("Yes");

		}else {
			System.out.print("No");

		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.nextLine(); S sc.nextLine() sc.nextLine sc if((S.contains("A") == true) && (S.contains("B") == true))  {
			System.out.print("Yes");

		}else {
			System.out.print("No");

		} (S.contains("A") == true) && (S.contains("B") == true) (S.contains("A") == true) S.contains("A") S.contains S "A" true (S.contains("B") == true) S.contains("B") S.contains S "B" true {
			System.out.print("Yes");

		} System.out.print("Yes") System.out.print System.out System System.out "Yes" {
			System.out.print("No");

		} System.out.print("No") System.out.print 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.nextLine();

		if((S.contains("A") == true) && (S.contains("B") == true))  {
			System.out.print("Yes");

		}else {
			System.out.print("No");

		}
	}

} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		String S = sc.nextLine();

		if((S.contains("A") == true) && (S.contains("B") == true))  {
			System.out.print("Yes");

		}else {
			System.out.print("No");

		}
	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		String S = sc.nextLine();

		if((S.contains("A") == true) && (S.contains("B") == true))  {
			System.out.print("Yes");

		}else {
			System.out.print("No");

		}
	}

}
