#!/usr/local/bin/python2
from itertools import chain, starmap
from operator import attrgetter
get_mro = attrgetter('__mro__')

class A(object): pass
class B(A): pass
class C(object): pass
class D(C): pass
class E(B, D): pass


for base in chain(base.__mro__ for base in D.__bases__):
  print base