class Array(object):

    def __init__(self, items: list) -> None:
        self.items = items
        self.length = len(items)

    def set_length(self, new_len):
        self.length = new_len

    def __repr__(self) -> str:
        return '{}({})'.format(self.__class__.__name__, self.items)

    def __len__(self) -> int:
        return self.length

    def __contains__(self, item: any) -> bool:
        return item in self.items

    def __getitem__(self, key: int) -> any:
        return self.items[key - 1]

    def __setitem__(self, key: int, value: any) -> None:
        self.items[key - 1] = value

    def __delitem__(self, key: int) -> None:
        del self.items[key - 1]


def check_arr(arr: Array) -> bool:
    n = len(arr)
    res = False
    for i in range(1, n + 1):
        n = n
        for j in range(n, i + 1, -1):
            n = n - i
            print(n)
            if arr[j] == arr[i]:
                res = True
    return res


def main():
    A = Array([5, 7, 1, 8, 5, 7])
    res = check_arr(A)
    print(res)


if __name__ == '__main__':
    main()