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#!/opt/local/bin/python
#
# See ../README.md
#
#
# Run as: python ch-1.py < input-file
#
import re
def get_time (time):
hours, minutes = map (lambda x: int (x), time . split (":"))
return (60 * hours + minutes)
def read_times ():
return (list (map (get_time,
re . findall (r'[0-9][0-9]:[0-9][0-9]', input ()))))
arrivals = read_times ()
departures = read_times ()
trains = [0] * (24 * 60)
for i in range (len (arrivals)):
arrival = arrivals [i]
departure = departures [i]
for i in range (arrival, departure + 1):
trains [i] = trains [i] + 1
if departure < arrival:
for i in range (0, departure + 1):
trains [i] = trains [i] + 1
for i in range (arrival, 24 * 60):
trains [i] = trains [i] + 1
print (max (trains))
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