def get_seconds(time):
    hours = int(time[:2])
    minutes = int(time[3:5])
    seconds = int(time[6:])
    return 3600 * hours + 60 * minutes + seconds

def is_in_range(time, min_time, max_time):
    time_seconds = get_seconds(time)
    min_time_seconds = get_seconds(min_time)
    max_time_seconds = get_seconds(max_time)
    return min_time_seconds <= time_seconds <= max_time_seconds

def generate_times_for_hour(hour):
    if len(set(hour)) == 2:
        return set([hour + ':' + m1  + s1 + ':' + m2 + s2 for m1 in hour for s1 in hour for m2 in hour for s2 in hour])
    else:
        letter = hour[0]
        letters = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"]
        combinations = [letter + x for x in letters]
        result = set()
        for xs in combinations:
            result = result.union(set([hour + ':' + m1 + s1 + ':' + m2 + s2 for m1 in xs for s1 in xs for m2 in xs for s2 in xs]))
        return result

def solution(S, T):
    startHour = int(S[:2])
    endHour = int(T[:2])
    result = 0
    for h in range(startHour, endHour+1):
        result += len([time for time in generate_times_for_hour(str(h)) if is_in_range(time, S, T)])
    return result


# print(solution("11:12:43", "16:13:10"))
print(solution("22:22:21", "22:22:23"))