import java.util.Scanner;

public class Main{
    public static void main(String [] args) {
        Scanner scanner = new Scanner(System.in);
        String stations = scanner.nextLine();
        if (stations.contains("AB") || stations.contains("BA")) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    }

} import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String [] args) {
        Scanner scanner = new Scanner(System.in);
        String stations = scanner.nextLine();
        if (stations.contains("AB") || stations.contains("BA")) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    }

} Main public static void main(String [] args) {
        Scanner scanner = new Scanner(System.in);
        String stations = scanner.nextLine();
        if (stations.contains("AB") || stations.contains("BA")) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    } main {
        Scanner scanner = new Scanner(System.in);
        String stations = scanner.nextLine();
        if (stations.contains("AB") || stations.contains("BA")) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) String stations = scanner.nextLine(); stations scanner.nextLine() scanner.nextLine scanner if (stations.contains("AB") || stations.contains("BA")) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        } stations.contains("AB") || stations.contains("BA") stations.contains("AB") stations.contains stations "AB" stations.contains("BA") stations.contains stations "BA" {
            System.out.println("Yes");
        } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
            System.out.println("No");
        } System.out.println("No") System.out.println System.out System System.out "No" String [] args args public class Main{
    public static void main(String [] args) {
        Scanner scanner = new Scanner(System.in);
        String stations = scanner.nextLine();
        if (stations.contains("AB") || stations.contains("BA")) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    }

} public class Main{
    public static void main(String [] args) {
        Scanner scanner = new Scanner(System.in);
        String stations = scanner.nextLine();
        if (stations.contains("AB") || stations.contains("BA")) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    }

} Main
import java.util.Scanner;

public class Main{
    public static void main(String [] args) {
        Scanner scanner = new Scanner(System.in);
        String stations = scanner.nextLine();
        if (stations.contains("AB") || stations.contains("BA")) {
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    }

}