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.
time = tuple(int(i) for i in input().split(':'))
sleep = tuple(int(i) for i in input().split(':'))
t = 60 * time[0] + time[1]
s = 60 * sleep[0] + sleep[1]

if t >= s:
    res = t - s
else:
    t += 1440
    res = t - s
    
    
    
if res < 60:
    print(f'00:{res}')
else:
    print(f'{res // 60}:{res % 60}')