import java.util.Scanner;

public class Main {
    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        String[] s = sc.next().split("");

        if(s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0])){
            System.out.println("No");
            return;

        }
        System.out.println("Yes");


    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        String[] s = sc.next().split("");

        if(s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0])){
            System.out.println("No");
            return;

        }
        System.out.println("Yes");


    }
} Main public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        String[] s = sc.next().split("");

        if(s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0])){
            System.out.println("No");
            return;

        }
        System.out.println("Yes");


    } main {

        Scanner sc = new Scanner(System.in);
        String[] s = sc.next().split("");

        if(s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0])){
            System.out.println("No");
            return;

        }
        System.out.println("Yes");


    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String[] s = sc.next().split(""); s sc.next().split("") sc.next().split sc.next() sc.next sc "" if(s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0])){
            System.out.println("No");
            return;

        } s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0]) s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0]) s[0].equals(s[1]) s[0].equals s[0] s 0 s[1] s 1 s[1].equals(s[2]) s[1].equals s[1] s 1 s[2] s 2 s[2].equals(s[0]) s[2].equals s[2] s 2 s[0] s 0 {
            System.out.println("No");
            return;

        } System.out.println("No") System.out.println System.out System System.out "No" return; 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.next().split("");

        if(s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0])){
            System.out.println("No");
            return;

        }
        System.out.println("Yes");


    }
} public class Main {
    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        String[] s = sc.next().split("");

        if(s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0])){
            System.out.println("No");
            return;

        }
        System.out.println("Yes");


    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        String[] s = sc.next().split("");

        if(s[0].equals(s[1]) && s[1].equals(s[2]) && s[2].equals(s[0])){
            System.out.println("No");
            return;

        }
        System.out.println("Yes");


    }
}