class Deque:
    def __init__(self, deque):
        self.deque = deque

    def push_back(self, elem):
        self.deque.append(elem)

    def pop_back(self):
        self.deque.pop(-1)

    def push_front(self, elem):
        self.deque.insert(0, elem)

    def pop_front(self):
        self.deque.pop(0)

    def show(self) -> list:
        return self.deque

    def size(self) -> int:
        return len(self.deque)

    def empty(self) -> bool:
        return len(self.deque) == 0


def get_sign(word, char):
    middle = (word.size() - 1) / 2
    index = word.deque.index(char)
    current_char = "мусор"
    if index <= middle:
        while current_char != char:
            current_char = word.deque[0]
            word.pop_front()
            print(current_char)
    else:
        while current_char != char:
            current_char = word.deque[-1]
            word.pop_back()
            print(current_char)


my_word = Deque(list("Привет"))
get_sign(my_word, "и")