import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int a = 0;
    int b = 0;
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    }
    String ans = "No";
    if((a > 0) && (b > 0)) ans = "Yes";
    System.out.println(ans);
  }
} import java.util.*; util.* java public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int a = 0;
    int b = 0;
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    }
    String ans = "No";
    if((a > 0) && (b > 0)) ans = "Yes";
    System.out.println(ans);
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int a = 0;
    int b = 0;
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    }
    String ans = "No";
    if((a > 0) && (b > 0)) ans = "Yes";
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int a = 0;
    int b = 0;
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    }
    String ans = "No";
    if((a > 0) && (b > 0)) ans = "Yes";
    System.out.println(ans);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc int a = 0; a 0 int b = 0; b 0 for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    } int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i++ i++ i {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    } {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    } if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      } s.charAt(i) == 'A' s.charAt(i) s.charAt s i 'A' {
        a++;
      } a++ a {
        b++;
      } b++ b String ans = "No"; ans "No" if((a > 0) && (b > 0)) ans = "Yes"; (a > 0) && (b > 0) (a > 0) a 0 (b > 0) b 0 ans = "Yes" ans "Yes" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int a = 0;
    int b = 0;
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    }
    String ans = "No";
    if((a > 0) && (b > 0)) ans = "Yes";
    System.out.println(ans);
  }
} public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int a = 0;
    int b = 0;
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    }
    String ans = "No";
    if((a > 0) && (b > 0)) ans = "Yes";
    System.out.println(ans);
  }
} Main
import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int a = 0;
    int b = 0;
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'A') {
        a++;
      } else {
        b++;
      }
    }
    String ans = "No";
    if((a > 0) && (b > 0)) ans = "Yes";
    System.out.println(ans);
  }
}