import java.lang.reflect.Array;
import java.util.*;


public class Main {

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

} import java.lang.reflect.Array; Array java.lang.reflect import java.util.*; util.* java public class Main {

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

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

} public class Main {

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

} Main
import java.lang.reflect.Array;
import java.util.*;


public class Main {

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

}
