class Cat:
    def __init__(self, name):
        self.name = name

    def to_dict(self):
        return {"name": self.name}

    @staticmethod
    def from_dict(data):
        return Cat(data["name"])


class Save:
    def __init__(self, version, cat: Cat):
        self.version = version
        self.cat = cat

    def to_dict(self):
        return {"version": self.version, "cat": self.cat.to_dict()}

    @staticmethod
    def from_dict(data):
        return Save(data["version"], Cat.from_dict(data["cat"]))