class Pouet:
    def __init__(self, foo=0, bar=0):
        self.foo = foo
        if foo >= 0:
            self.bar = bar
        else:
            self.bar = -bar

    def __str__(self):
        return "foo: %s, bar: %s" % (self.foo, self.bar)

    def __add__(self, other):
        n = Pouet()
        n.bar = self.bar + other.bar
        n.foo = self.foo + other.foo
        return n

    def toto(self):
	print self.bar

    

class Bik(Pouet):
    specific = 1

class Bok(Pouet):
    specific = 2

    def __str__(self):
        return "Bonjour, je suis Bok"