from datetime import date
from datetime import timedelta

def is_legal_date(date_string):
    year = int(date_string[:4])
    month = int(date_string[4:6])
    day = int(date_string[6:])
    try:
        date(year, month, day)
        return True
    except ValueError:
        return False
start = input()
end   = input()
cnt = 0
for try_date_half in range(10000):
    try_date_half = '{:0>4}'.format(try_date_half)
    try_date = try_date_half[::-1] + try_date_half
    if try_date >= start and try_date <= end and is_legal_date(try_date):
        cnt += 1
print(cnt)