from pathlib import Path


def get_ordered_lists(data_file: Path) -> tuple[list[int], list[int]]:
    list1 = list()
    list2 = list()
    for line in data_file.open():
        numbers = line.strip().split("  ")
        list1.append(int(numbers[0]))
        list2.append(int(numbers[1]))
    return sorted(list1), sorted(list2)


def compute_distance(list1, list2) -> int:
    return sum([abs(item2 - item1) for item1, item2 in zip(list1, list2)])


def compute(data_file: Path) -> int:
    list1, list2 = get_ordered_lists(data_file)
    return compute_distance(list1, list2)


def main():
    file = Path(__file__).parent / "first-input"
    print(compute(file))


if __name__ == "__main__":
    main()