VOWELS = "aeiou"


class User:
    def __init__(self, name):
        self.name = name
        self.chat = None

    def connect_on_chat(self, o_chat):
        self.chat = o_chat

    def send(self, text):
        self.chat.human_chat += "{} said: {}\n".format(self.name, text)
        robot_text = text.lower()
        robot_text = "".join(["0" if x in VOWELS else "1" for x in robot_text])
        self.chat.robot_chat += "{} said: {}\n".format(self.name, robot_text)


class Human(User):
    pass


class Robot(User):
    pass


class Chat:
    def __init__(self):
        self.human_chat = ""
        self.robot_chat = ""

    def connect_human(self, human: Human):
        human.connect_on_chat(self)

    def show_human_dialogue(self) -> str:
        return self.human_chat.strip('\n')

    def connect_robot(self, robot: Robot):
        robot.connect_on_chat(self)

    def show_robot_dialogue(self) -> str:
        return self.robot_chat.strip('\n')


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

    chat = Chat()
    karl = Human("Karl")
    bot = Robot("R2D2")
    chat.connect_human(karl)
    chat.connect_robot(bot)
    karl.send("Hi! What's new?")
    bot.send("Hello, human. Could we speak later about it?")
    assert chat.show_human_dialogue() == """Karl said: Hi! What's new?
R2D2 said: Hello, human. Could we speak later about it?"""
    assert chat.show_robot_dialogue() == """Karl said: 101111011111011
R2D2 said: 10110111010111100111101110011101011010011011"""

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