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