import java.util.*;

public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		String s = sc.next();
		
		System.out.println((s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No");
		
	}

} import java.util.*; util.* java public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		String s = sc.next();
		
		System.out.println((s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No");
		
	}

} Main public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		String s = sc.next();
		
		System.out.println((s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No");
		
	} main {
		
		Scanner sc = new Scanner(System.in);
		
		String s = sc.next();
		
		System.out.println((s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No");
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc System.out.println((s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No") System.out.println System.out System System.out (s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No" (s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) s.charAt(0) != s.charAt(1) s.charAt(0) s.charAt s 0 s.charAt(1) s.charAt s 1 s.charAt(1) != s.charAt(2) s.charAt(1) s.charAt s 1 s.charAt(2) s.charAt s 2 "Yes" "No" String[] args args public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		String s = sc.next();
		
		System.out.println((s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No");
		
	}

} public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		String s = sc.next();
		
		System.out.println((s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No");
		
	}

} Main
import java.util.*;

public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		String s = sc.next();
		
		System.out.println((s.charAt(0) != s.charAt(1) || s.charAt(1) != s.charAt(2)) ? "Yes" : "No");
		
	}

}