class Cat:
    def __init__(self, name, birth_year):
        self.mother = None
        self.children = []
        pass

def read_data(filename="cats.txt"):
    """
    Funkcia nacita data zo vstupneho suboru, vytvori potrebne objekty a vrati dvojicu slovnikov
    :param filename: nazov suboru, alebo cesta k nemu
    :return: slovnik maciek a slovnik utulkov
    """
    with open(filename, "r") as my_file:
        for line in my_file.readlines():
            line = line.strip()
            pass
    return None, None #here return your dictionaries

def print_offsprings_tree(cat_name, cat_dictionary):
    pass


def print_shelter_cats(shelter_name, shelter_dictionary):
    pass


def sort_shelter(shelter_name, shelter_dictionary):
    pass

def find_eldest(cat):
    pass

def test():
    cats, shelters = read_data()

    #here you can write your tests

test()