class A(object):
    def go(self):
        print("go A go!")
    def stop(self):
        print("stop A stop!")
    def pause(self):
        raise Exception("Not Implemented")

class B(A):
    def go(self):
        super(B, self).go()
        print("go B go!")

class C(A):
    def go(self):
        super(C, self).go()
        print("go C go!")
    def stop(self):
        super(C, self).stop()
        print("stop C stop!")

class D(B,C,A):
    def go(self):
        super(D, self).go()
        print("go D go!")
    def stop(self):
        super(D, self).stop()
        print("stop D stop!")
    def pause(self):
        print("wait D wait!")

class E(B,C): pass

a = A()
b = B()
c = C()
d = D()
e = E()
#
# # specify output from here onwards
#
#a.go()
# b.go()
# c.go()
# d.go()
# e.go()
#
# a.stop()
# b.stop()
# c.stop()
# d.stop()
# e.stop()
#
# a.pause()
# b.pause()
# c.pause()
# d.pause()
e.pause()