import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);	
		String S = sc.next();

		S = S.replaceAll("AAA","-");
		S = S.replaceAll("BBB","-");
		S = S.replaceAll("-","");
		if(S.length()==0){
			System.out.println("No");			
		} else {
			System.out.println("Yes");

		}

	}
}
 import java.util.*; util.* java public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);	
		String S = sc.next();

		S = S.replaceAll("AAA","-");
		S = S.replaceAll("BBB","-");
		S = S.replaceAll("-","");
		if(S.length()==0){
			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();

		S = S.replaceAll("AAA","-");
		S = S.replaceAll("BBB","-");
		S = S.replaceAll("-","");
		if(S.length()==0){
			System.out.println("No");			
		} else {
			System.out.println("Yes");

		}

	} main {
		Scanner sc = new Scanner(System.in);	
		String S = sc.next();

		S = S.replaceAll("AAA","-");
		S = S.replaceAll("BBB","-");
		S = S.replaceAll("-","");
		if(S.length()==0){
			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 S = S.replaceAll("AAA","-") S S.replaceAll("AAA","-") S.replaceAll S "AAA" "-" S = S.replaceAll("BBB","-") S S.replaceAll("BBB","-") S.replaceAll S "BBB" "-" S = S.replaceAll("-","") S S.replaceAll("-","") S.replaceAll S "-" "" if(S.length()==0){
			System.out.println("No");			
		} else {
			System.out.println("Yes");

		} S.length()==0 S.length() S.length S 0 {
			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();

		S = S.replaceAll("AAA","-");
		S = S.replaceAll("BBB","-");
		S = S.replaceAll("-","");
		if(S.length()==0){
			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();

		S = S.replaceAll("AAA","-");
		S = S.replaceAll("BBB","-");
		S = S.replaceAll("-","");
		if(S.length()==0){
			System.out.println("No");			
		} else {
			System.out.println("Yes");

		}

	}
} Main
import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);	
		String S = sc.next();

		S = S.replaceAll("AAA","-");
		S = S.replaceAll("BBB","-");
		S = S.replaceAll("-","");
		if(S.length()==0){
			System.out.println("No");			
		} else {
			System.out.println("Yes");

		}

	}
}

