with open("./src/2-day/input.txt", "r") as file:
    durs = file.readline().split(",")

    correct_cnt = 0

    for dur in durs:
        first, last = map(int, dur.split("-"))

        for number in range(first, last + 1):
            number = str(number)

            if len(number) % 2:
                continue

            if number[: len(number) // 2] * 2 == number:
                correct_cnt += int(number)

    print(correct_cnt)