class Person:
    _first_name: str
    _last_name: str

    def __init__(self, first_name: str, last_name: str):
        self._first_name = first_name
        self._last_name = last_name

    def fullname(self):
        return f"{self._first_name} {self._last_name}"


john = Person("John", "Doe")

# print(john._first_name)
print(john.fullname())
