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.
wh,wm = input().split(':')
wm = int(wm)
wh = int(wh)
sh,sm = input().split(':')
sm = int(sm)
sh = int(sh)
if sh > wh:
    h = 23 - (sh - wh)
    if wh == 0:
        h = 24 - sh
else:
    h = wh - sh;
h = str(h)
if len(h) == 1:
    h = "0" + h;
w = abs(sm-wm)
w = str(w)
if len(w) == 1:
    w = "0" + w
print(f"{h}:{w}")