import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String bus = sc.next();
		sc.close();

		if(bus.charAt(0) == bus.charAt(1)) {
			if(bus.charAt(1) == bus.charAt(2)) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			}
		}else {
			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 bus = sc.next();
		sc.close();

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

		if(bus.charAt(0) == bus.charAt(1)) {
			if(bus.charAt(1) == bus.charAt(2)) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			}
		}else {
			System.out.println("Yes");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String bus = sc.next();
		sc.close();

		if(bus.charAt(0) == bus.charAt(1)) {
			if(bus.charAt(1) == bus.charAt(2)) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			}
		}else {
			System.out.println("Yes");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String bus = sc.next(); bus sc.next() sc.next sc sc.close() sc.close sc if(bus.charAt(0) == bus.charAt(1)) {
			if(bus.charAt(1) == bus.charAt(2)) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			}
		}else {
			System.out.println("Yes");
		} bus.charAt(0) == bus.charAt(1) bus.charAt(0) bus.charAt bus 0 bus.charAt(1) bus.charAt bus 1 {
			if(bus.charAt(1) == bus.charAt(2)) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			}
		} if(bus.charAt(1) == bus.charAt(2)) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			} bus.charAt(1) == bus.charAt(2) bus.charAt(1) bus.charAt bus 1 bus.charAt(2) bus.charAt bus 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" {
			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 sc = new Scanner(System.in);
		String bus = sc.next();
		sc.close();

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

		if(bus.charAt(0) == bus.charAt(1)) {
			if(bus.charAt(1) == bus.charAt(2)) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			}
		}else {
			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 bus = sc.next();
		sc.close();

		if(bus.charAt(0) == bus.charAt(1)) {
			if(bus.charAt(1) == bus.charAt(2)) {
				System.out.println("No");
			}else {
				System.out.println("Yes");
			}
		}else {
			System.out.println("Yes");
		}
	}
}