import java.util.Scanner;

public class Main {

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