import java.util.Scanner;

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

		char[] value = new char[3];

		value = sc.next().toCharArray();
		if(value[0] != value[1] || value[1] != value[2])
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		char[] value = new char[3];

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

		char[] value = new char[3];

		value = sc.next().toCharArray();
		if(value[0] != value[1] || value[1] != value[2])
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner(System.in);

		char[] value = new char[3];

		value = sc.next().toCharArray();
		if(value[0] != value[1] || value[1] != value[2])
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char[] value = new char[3]; value new char[3] 3 value = sc.next().toCharArray() value sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc if(value[0] != value[1] || value[1] != value[2])
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		} value[0] != value[1] || value[1] != value[2] value[0] != value[1] value[0] value 0 value[1] value 1 value[1] != value[2] value[1] value 1 value[2] value 2 {
			System.out.println("Yes");
		} System.out.println("Yes") System.out.println System.out System System.out "Yes" {
			System.out.println("No");
		} System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		char[] value = new char[3];

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

		char[] value = new char[3];

		value = sc.next().toCharArray();
		if(value[0] != value[1] || value[1] != value[2])
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} Main
import java.util.Scanner;

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

		char[] value = new char[3];

		value = sc.next().toCharArray();
		if(value[0] != value[1] || value[1] != value[2])
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
}
