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.
jam,menit=map(int,input().split(':'))
lamajam,lamamenit=map(int,input().split(':'))
a=str((jam-lamajam)%24)
b=str((menit-lamamenit)%60)
if len(a)==1:
	a='0'+a
if len(b)==1:
	b='0'+b
print(a+':'+b)
		 	 	 	  	 	 			   	 		    	 	