import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.nextLine();
		if(s.contains("A")&& s.contains("B")) System.out.println("Yes");
		else System.out.println("No");
	}

} 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.nextLine();
		if(s.contains("A")&& s.contains("B")) System.out.println("Yes");
		else System.out.println("No");
	}

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

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.nextLine();
		if(s.contains("A")&& s.contains("B")) System.out.println("Yes");
		else System.out.println("No");
	}

} public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.nextLine();
		if(s.contains("A")&& s.contains("B")) System.out.println("Yes");
		else System.out.println("No");
	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.nextLine();
		if(s.contains("A")&& s.contains("B")) System.out.println("Yes");
		else System.out.println("No");
	}

}
