import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        sc.close();
        if("AAA".equals(s) || "BBB".equals(s)){
            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 sc = new Scanner(System.in);
        String s = sc.next();
        sc.close();
        if("AAA".equals(s) || "BBB".equals(s)){
            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.next();
        sc.close();
        if("AAA".equals(s) || "BBB".equals(s)){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }   
    } main {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        sc.close();
        if("AAA".equals(s) || "BBB".equals(s)){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }   
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc sc.close() sc.close sc if("AAA".equals(s) || "BBB".equals(s)){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        } "AAA".equals(s) || "BBB".equals(s) "AAA".equals(s) "AAA".equals "AAA" s "BBB".equals(s) "BBB".equals "BBB" s {
            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.next();
        sc.close();
        if("AAA".equals(s) || "BBB".equals(s)){
            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.next();
        sc.close();
        if("AAA".equals(s) || "BBB".equals(s)){
            System.out.println("No");
        } else {
            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();
        sc.close();
        if("AAA".equals(s) || "BBB".equals(s)){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }   
    }
}