import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException {
		
		InputStreamReader in = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(in);
		
		String line = br.readLine();
		
		if((line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {
	public static void main(String[] args) throws IOException {
		
		InputStreamReader in = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(in);
		
		String line = br.readLine();
		
		if((line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}

} Main public static void main(String[] args) throws IOException {
		
		InputStreamReader in = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(in);
		
		String line = br.readLine();
		
		if((line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	} main {
		
		InputStreamReader in = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(in);
		
		String line = br.readLine();
		
		if((line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	} InputStreamReader in = new InputStreamReader(System.in); in new InputStreamReader(System.in) BufferedReader br = new BufferedReader(in); br new BufferedReader(in) String line = br.readLine(); line br.readLine() br.readLine br if((line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} (line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1) (line.lastIndexOf("A") != -1) line.lastIndexOf("A") line.lastIndexOf line "A" -1 1 (line.lastIndexOf("B") != -1) line.lastIndexOf("B") line.lastIndexOf line "B" -1 1 {
			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) throws IOException {
		
		InputStreamReader in = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(in);
		
		String line = br.readLine();
		
		if((line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}

} public class Main {
	public static void main(String[] args) throws IOException {
		
		InputStreamReader in = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(in);
		
		String line = br.readLine();
		
		if((line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException {
		
		InputStreamReader in = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(in);
		
		String line = br.readLine();
		
		if((line.lastIndexOf("A") != -1)
				&& (line.lastIndexOf("B") != -1)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}

}
