class MyNode:
    def __init__(self, contained_object):
        self.contained_object = contained_object
        self.next = None

class MyQueue:
    def __init__(self):
        self.head = None

    def add(self, elem):
        if self.head is None:
            self.head = MyNode(elem)
            return

        last_elem = self.head
        while last_elem.next is not None:
            last_elem = last_elem.next

        last_elem.next = MyNode(elem)

    def remove(self):
        if self.head is None:
            raise Exception("queue is empty")

        obj = self.head.contained_object
        self.head = self.head.next
        return obj

    def clear(self):
        self.head = None

    def to_list(self):
        arr = []
        elem = self.head

        while elem is not None:
            arr.append(elem.contained_object)
            elem = elem.next

        return arr


class Country:
    def __init__(self, name: str, capital: str):
        self.name = name
        self.capital = capital

    def __str__(self):
        return f"'{self.name}' country, capital: {self.capital}"

    def __repr__(self):
        return f"<{self.__str__()}>"

numbers_queue = MyQueue()

numbers_queue.add(1)
numbers_queue.add(2)
numbers_queue.add(3)

print(numbers_queue.to_list())

print(numbers_queue.remove())
print(numbers_queue.remove())
print(numbers_queue.remove())

countries_queue = MyQueue()

countries_queue.add(Country("Russia", "Moscow"))
countries_queue.add(Country("USA", "Washington"))
countries_queue.add(Country("UK", "London"))

print(countries_queue.to_list())

print(countries_queue.remove())
print(countries_queue.remove())
print(countries_queue.remove())