class RealEstate:
    def __init__(self, location):
        self.__location = location


class Residential(RealEstate):
    def __init__(self, location, bedrooms):
        super().__init__(location)
        self.__bedrooms = bedrooms


class House(Residential):
    def __init__(self, location, bedrooms, yard_size):
        super().__init__(location, bedrooms)
        self.__yard_size = yard_size