import java.util.*; 

class Probe implements Comparator<Fruit> {
  public int compare(Fruit a, Fruit b) {
    if (a instanceof Apple  && b instanceof Orange) return 1; 
    else if (a instanceof Apple  && b instanceof Apple ) return 0;
    else if (a instanceof Orange && b instanceof Orange) return 0;
    else // if (a instanceof Orange && b instanceof Apple ) 
      return -1;
  } 
}