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.
waktubangun = input('')
lamatidur = input('')
list_jamtidur = []
list_menittidur = []

jamtidur = int(waktubangun[:2])- int(lamatidur[:2])
if jamtidur<0:
   jamtidur += 24
jamtidur = str(jamtidur)
list_jamtidur.append(int(jamtidur[0]))
if len(jamtidur) > 1:
    list_jamtidur.append(int(jamtidur[1]))

menittidur = int(waktubangun[3:])- int(lamatidur[3:])
if menittidur<0:
   menittidur += 60
menittidur = str(menittidur)
list_menittidur.append(int(menittidur[0]))
if len(menittidur) > 1:
    list_menittidur.append(int(menittidur[1]))

if len(list_jamtidur) < 2 and len(list_menittidur) < 2:
    print('0{}:0{}'.format(jamtidur,menittidur))
elif len(list_jamtidur) < 2 and len(list_menittidur) >= 2:
    print('0{}:{}'.format(jamtidur,menittidur))
elif len(list_jamtidur) >= 2 and len(list_menittidur) < 2:
    print('{}:0{}'.format(jamtidur,menittidur))
else:
    print('{}:{}'.format(jamtidur,menittidur))

  	    	 	  	  				     		   		