import java.util.Scanner;

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