import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		if (s.charAt(0) == s.charAt(1) && s.charAt(1) == s.charAt(2)) {
			System.out.println("No");
			return;
		}
		System.out.println("Yes");

	}

} 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.next();

		if (s.charAt(0) == s.charAt(1) && s.charAt(1) == s.charAt(2)) {
			System.out.println("No");
			return;
		}
		System.out.println("Yes");

	}

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

		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		if (s.charAt(0) == s.charAt(1) && s.charAt(1) == s.charAt(2)) {
			System.out.println("No");
			return;
		}
		System.out.println("Yes");

	} main {

		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		if (s.charAt(0) == s.charAt(1) && s.charAt(1) == s.charAt(2)) {
			System.out.println("No");
			return;
		}
		System.out.println("Yes");

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc if (s.charAt(0) == s.charAt(1) && s.charAt(1) == s.charAt(2)) {
			System.out.println("No");
			return;
		} 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 {
			System.out.println("No");
			return;
		} System.out.println("No") System.out.println System.out System System.out "No" return; 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 sc = new Scanner(System.in);
		String s = sc.next();

		if (s.charAt(0) == s.charAt(1) && s.charAt(1) == s.charAt(2)) {
			System.out.println("No");
			return;
		}
		System.out.println("Yes");

	}

} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		if (s.charAt(0) == s.charAt(1) && s.charAt(1) == s.charAt(2)) {
			System.out.println("No");
			return;
		}
		System.out.println("Yes");

	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		if (s.charAt(0) == s.charAt(1) && s.charAt(1) == s.charAt(2)) {
			System.out.println("No");
			return;
		}
		System.out.println("Yes");

	}

}
