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 = list(map(int, input().split(":")))
e = list(map(int, input().split(":")))
hh, mm = 0, 0

if s[0]-e[0] < 0:
    hh = 24-abs(s[0]-e[0])
else:
    hh = s[0]-e[0]

if s[1]-e[1] < 0:
    if hh-1 < 0:
        hh = 23
    mm = 60-abs(s[1]-e[1])
else:
    mm = s[1]-e[1]
mm = str(mm)
hh = str(hh)
if len(hh) == 1:
    hh = "0"+hh
if len(mm) == 1:
    mm = "0"+mm
print(f"{hh}:{mm}")
