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()
b=input()
c=a[0]+a[1]
f=a[3]+a[4]
c1=b[0]+b[1]
f1=b[3]+b[4]
d=int(c)*60
c=int(c1)*60
g=int(f)
h=int(f1)
if((d+g)-(c-h)>0):
    print(int(d/60-c/60),':', g-h)
if((d+g)-(c-h)>0):
    print(24-int(d/60-c/60),':', g-h)
