import java.util.*;

class A implements Comparable<A> {
  int x;
  A(int y) { x = y; }
  public String toString() { return Integer.toString(x); }
  public int compareTo(A a2) { 
    if (this.x < a2.x) return -1; 
    else if (this.x == a2.x) return 0;
    else return 1;
  }
}

class CA implements Comparator<A> {
  public int compare (A a1, A a2) { return a2.compareTo(a1); }
}

class B extends A {
  B(int y) { super(y); }

  static List<B> makeList() {
    List<B> ls = new java.util.LinkedList<B>();
    ls.add(new B(1));
    ls.add(new B(2));
    ls.add(new B(3));
    ls.add(new B(4));
    return ls;
  }
}