import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.charAt(0)==s.charAt(1) && s.charAt(1)==s.charAt(2)) {
            System.out.print("No");
        } else {
            System.out.print("Yes");
        }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.charAt(0)==s.charAt(1) && s.charAt(1)==s.charAt(2)) {
            System.out.print("No");
        } else {
            System.out.print("Yes");
        }
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.charAt(0)==s.charAt(1) && s.charAt(1)==s.charAt(2)) {
            System.out.print("No");
        } else {
            System.out.print("Yes");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.charAt(0)==s.charAt(1) && s.charAt(1)==s.charAt(2)) {
            System.out.print("No");
        } else {
            System.out.print("Yes");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc if (s.charAt(0)==s.charAt(1) && s.charAt(1)==s.charAt(2)) {
            System.out.print("No");
        } else {
            System.out.print("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.print("No");
        } System.out.print("No") System.out.print System.out System System.out "No" {
            System.out.print("Yes");
        } System.out.print("Yes") System.out.print 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.next();
        if (s.charAt(0)==s.charAt(1) && s.charAt(1)==s.charAt(2)) {
            System.out.print("No");
        } else {
            System.out.print("Yes");
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.charAt(0)==s.charAt(1) && s.charAt(1)==s.charAt(2)) {
            System.out.print("No");
        } else {
            System.out.print("Yes");
        }
    }
} Main
import java.util.*;

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