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.
a = input().split(':')
b = input().split(':')
if a[0] == b[0]:
    e = '00:'
    d = int(a[1])-int(b[1])
    f = f"{d:02}"
    e = e+ str(f)
else:
    if a[0] == '00':
        c = str(24 - int(b[0]))
        e = c+':'
        d = int(a[1])-int(b[1])
        f = f"{d:02}"
        e = e+ str(f)
    else:
        e = str(int(a[1]) - int(b[1]))
        d = int(a[1])-int(b[1])
        f = f"{d:02}"
        e = e+ str(f)

print(e)

