FILE = "input.txt"

def main():
    line = open(FILE).readlines()[0].strip()

    ranges = [
        [int(n) for n in l.split("-")]
        for l in line.split(",")
    ]

    invalid_ids = [
        id
        for (start, end) in ranges
        for id in range(start, end + 1)
        if invalid(str(id))
    ]

    return sum(invalid_ids)

def invalid(id):
    if len(id) % 2 == 1: return False
    a, b = id[:(len(id)//2)], id[(len(id)//2):]
    return a == b

if __name__ == "__main__":
    print(main())