class ListDeque:

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

    def __size__(self):
        return len(self.__items)

    def is_empty(self):
        return self.__items == []

    def add_first(self, item):
        self.__items.insert(0, item)

    def add_last(self, item):
        self.__items.append(item)

    def get_first(self):
        return self.__items[0]

    def get_last(self):
        return self.__items[-1]

    def remove_first(self):
        return self.__items.pop(0)

    def remove_last(self):
        return self.__items.pop()

    def clear(self):
        return self.__items.clear()