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

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String str = br.readLine();

		if (str.equals("AAA") || str.equals("BBB")) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
	}
} 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 {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String str = br.readLine();

		if (str.equals("AAA") || str.equals("BBB")) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
	}
} Main public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String str = br.readLine();

		if (str.equals("AAA") || str.equals("BBB")) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
	} main {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String str = br.readLine();

		if (str.equals("AAA") || str.equals("BBB")) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
	} BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String str = br.readLine(); str br.readLine() br.readLine br if (str.equals("AAA") || str.equals("BBB")) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		} str.equals("AAA") || str.equals("BBB") str.equals("AAA") str.equals str "AAA" str.equals("BBB") str.equals str "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) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String str = br.readLine();

		if (str.equals("AAA") || str.equals("BBB")) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
	}
} public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String str = br.readLine();

		if (str.equals("AAA") || str.equals("BBB")) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String str = br.readLine();

		if (str.equals("AAA") || str.equals("BBB")) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
	}
}