import java.util.*;
public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		for(int i = 0; i < 2; i++) {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		}
		System.out.println("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();
		for(int i = 0; i < 2; i++) {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		}
		System.out.println("No");
	}
} Main public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		for(int i = 0; i < 2; i++) {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		}
		System.out.println("No");
	} main {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		for(int i = 0; i < 2; i++) {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		}
		System.out.println("No");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc for(int i = 0; i < 2; i++) {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		} int i = 0; int i = 0; i 0 i < 2 i 2 i++ i++ i {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		} {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		} if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			} !S.substring(i + 1, i + 2).equals(S.substring(i, i + 1)) S.substring(i + 1, i + 2).equals(S.substring(i, i + 1)) S.substring(i + 1, i + 2).equals S.substring(i + 1, i + 2) S.substring S i + 1 i 1 i + 2 i 2 S.substring(i, i + 1) S.substring S i i + 1 i 1 {
				System.out.println("Yes");
				return;
			} System.out.println("Yes") System.out.println System.out System System.out "Yes" return; 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);
		String S = sc.next();
		for(int i = 0; i < 2; i++) {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		}
		System.out.println("No");
	}
} public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		for(int i = 0; i < 2; i++) {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		}
		System.out.println("No");
	}
} Main
import java.util.*;
public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		for(int i = 0; i < 2; i++) {
			if(!S.substring(i + 1, i + 2).equals(S.substring(i, i + 1))) {
				System.out.println("Yes");
				return;
			}
		}
		System.out.println("No");
	}
}
