import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String str = scan.next();
		if(str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2)) {
			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 scan = new Scanner(System.in);
		String str = scan.next();
		if(str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2)) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String str = scan.next();
		if(str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2)) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	} main {
		Scanner scan = new Scanner(System.in);
		String str = scan.next();
		if(str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2)) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String str = scan.next(); str scan.next() scan.next scan if(str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2)) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		} str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2) str.charAt(0) == str.charAt(1) str.charAt(0) str.charAt str 0 str.charAt(1) str.charAt str 1 str.charAt(1) == str.charAt(2) str.charAt(1) str.charAt str 1 str.charAt(2) str.charAt str 2 {
			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 scan = new Scanner(System.in);
		String str = scan.next();
		if(str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2)) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
} public class Main{
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String str = scan.next();
		if(str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2)) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
} Main
import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String str = scan.next();
		if(str.charAt(0) == str.charAt(1) && str.charAt(1) == str.charAt(2)) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
}