import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String s = scanner.next();
		s = s.replaceAll("A", "");
		
		if (s.length() == 0 || s.length() == 3) {
			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 scanner = new Scanner(System.in);
		String s = scanner.next();
		s = s.replaceAll("A", "");
		
		if (s.length() == 0 || s.length() == 3) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
		
	}
} Main public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String s = scanner.next();
		s = s.replaceAll("A", "");
		
		if (s.length() == 0 || s.length() == 3) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
		
	} main {
		Scanner scanner = new Scanner(System.in);
		String s = scanner.next();
		s = s.replaceAll("A", "");
		
		if (s.length() == 0 || s.length() == 3) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
		
	} Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) String s = scanner.next(); s scanner.next() scanner.next scanner s = s.replaceAll("A", "") s s.replaceAll("A", "") s.replaceAll s "A" "" if (s.length() == 0 || s.length() == 3) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		} s.length() == 0 || s.length() == 3 s.length() == 0 s.length() s.length s 0 s.length() == 3 s.length() s.length s 3 {
			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 scanner = new Scanner(System.in);
		String s = scanner.next();
		s = s.replaceAll("A", "");
		
		if (s.length() == 0 || s.length() == 3) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
		
	}
} public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String s = scanner.next();
		s = s.replaceAll("A", "");
		
		if (s.length() == 0 || s.length() == 3) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
		
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String s = scanner.next();
		s = s.replaceAll("A", "");
		
		if (s.length() == 0 || s.length() == 3) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
		
	}
}	