class SimpleIter4:
    def __init__(self, data):
        self.data = data
        self.result = []
        evens = [data[i] for i in range(0, len(data), 2)][::-1]
        odds = [data[i] for i in range(1, len(data), 2)]
        self.result = evens + odds
        self.index = 0

    def __iter__(self):
        return self

    def __next__(self):
        if self.index >= len(self.result):
            raise StopIteration
        val = self.result[self.index]
        self.index += 1
        return val


while True:
    print("1 - Ввести список")
    print("0 - Выход")
    choice = input("Выбор: ")

    if choice == "0":
        break

    if choice == "1":
        try:
            data = input("Введите элементы через пробел: ").split()
            it = SimpleIter4(data)
            for x in it:
                print(x)
        except:
            print("Ошибка")