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 = [int(x) for x in input().split(':')]
t = [int(x) for x in input().split(':')]

res = ('0'+str((s[0]-t[0])%24), '0'+str((s[1]-t[1])%60))
print('%s:%s' % (res[0][len(res[0])-2:], res[1][len(res[1])-2:]))