George woke up and saw the current time *s* on the digital clock. Besides, George knows that he has slept for time *t*. 

Help George! Write a program that will, given time *s* and *t*, determine the time *p* when George went to bed. Note that George could have gone to bed yesterday relatively to the current time (see the second test sample).
The first line contains current time *s* as a string in the format "hh:mm". The second line contains time *t* in the format "hh:mm" — the duration of George's sleep. It is guaranteed that the input contains the correct time in the 24-hour format, that is, 00 ≤ *hh* ≤ 23, 00 ≤ *mm* ≤ 59.
s = input()
t = input()

s_hours, s_minutes = map(int, s.split(":"))
t_hours, t_minutes = map(int, t.split(":"))

hours = s_hours - t_hours
minutes = s_minutes - t_minutes

if minutes < 0:
    minutes += 60
    hours -= 1

hours = (hours + 24) % 24

time_formatted = f"{hours:02d}:{minutes:02d}"
print(time_formatted)
