from typing import List


class sms(object):
    sender: str = ""
    text: str = ""

    def __init__(self, sender: str, text: str) -> None:
        self.sender = sender
        self.text = text


class Parser_Base(object):
    messages: List[sms] = []

    def __init__(self):
        self.messages = []

    def __iter__(self):
        return self

    def __next__(self) -> sms:
        if not bool(self.messages):
            raise StopIteration
        return self.messages.pop(0)