def parse(args: List[str]) -> Tuple[str, List[int]]:

    arguments = collections.deque(args)

    separator = "\n"

    operands: List[int] = []

    while arguments:

        arg = arguments.popleft()

        if not operands:

            if arg == "--help":

                print(USAGE)

                sys.exit(0)

            if arg in ("-s", "--separator"):

                separator = arguments.popleft()

                continue

        try:

            operands.append(int(arg))

        except ValueError:

            raise SystemExit(USAGE)

        if len(operands) > 3:

            raise SystemExit(USAGE)

    return separator, operands