#!/usr/local/bin/python2
class C(object):
    def __init__(self, i):
      self.priority  = i

    def __repr__(self):
      return str(self.i)

    def __le__(self, other):
        return self.priority <= other

    def __lt__(self, other):
        return self.priority < other

    def __ge__(self, other):
        return self.priority >= other

    def __gt__(self, other):
        return self.priority > other

    def __eq__(self, other):
        return self.priority == other


print sorted([C(0), C(-1), C(5), C(1), C(-4), C(0)])