class Monad:

    def __init__(self, bind, value):
        self.__bind = bind
        self.__m = unit(value)

    def bind(self, f):
        self.__m = self.__bind(self.__m, f)
        return self

    def __lshift__(self, f):
        self.__m = self.__bind(self.__m, f)
        return self


"""
if __name__ == "__main__":
    Monad(bind, 1) << (lambda x: x+10) << (lambda x: 2*x)

    add = lambda a, b: a+b
    print(list(zip([1,2,3],[4,5,6])))

    print(list(zipWith(add,[1,2,3],[4,5,6])))
"""