import java.util.*;

public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    char c[] = s.toCharArray();

    if (c[0] == c[1] && c[1] == c[2]) {
      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();
    char c[] = s.toCharArray();

    if (c[0] == c[1] && c[1] == c[2]) {
      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();
    char c[] = s.toCharArray();

    if (c[0] == c[1] && c[1] == c[2]) {
      System.out.println("No");
    } else {
      System.out.println("Yes");
    }
  } main {

    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    char c[] = s.toCharArray();

    if (c[0] == c[1] && c[1] == c[2]) {
      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 char c[] = s.toCharArray(); c s.toCharArray() s.toCharArray s if (c[0] == c[1] && c[1] == c[2]) {
      System.out.println("No");
    } else {
      System.out.println("Yes");
    } c[0] == c[1] && c[1] == c[2] c[0] == c[1] c[0] c 0 c[1] c 1 c[1] == c[2] c[1] c 1 c[2] c 2 {
      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();
    char c[] = s.toCharArray();

    if (c[0] == c[1] && c[1] == c[2]) {
      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();
    char c[] = s.toCharArray();

    if (c[0] == c[1] && c[1] == c[2]) {
      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();
    char c[] = s.toCharArray();

    if (c[0] == c[1] && c[1] == c[2]) {
      System.out.println("No");
    } else {
      System.out.println("Yes");
    }
  }
}
