class Warrior:
    def __init__(self):
        self.health = 50
        self.attack = 5
        self.is_alive = True

    def hit(self, other_unit) -> bool:
        other_unit.health -= self.attack
        other_unit.is_alive = other_unit.health > 0
        return other_unit.is_alive


class Knight(Warrior):
    def __init__(self):
        super().__init__()
        self.attack = 7


def fight(unit_1, unit_2):
    while unit_1.is_alive and unit_2.is_alive:
        if not unit_1.hit(unit_2):
            return True
        if not unit_2.hit(unit_1):
            return False


if __name__ == '__main__':
    # These "asserts" using only for self-checking and not necessary for auto-testing

    chuck = Warrior()
    bruce = Warrior()
    carl = Knight()
    dave = Warrior()
    mark = Warrior()

    assert fight(chuck, bruce) == True
    assert fight(dave, carl) == False
    assert chuck.is_alive == True
    assert bruce.is_alive == False
    assert carl.is_alive == True
    assert dave.is_alive == False
    assert fight(carl, mark) == False
    assert carl.is_alive == False

    print("Coding complete? Let's try tests!")