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 = input()
t = input()
p = "" h = 0  m = 0

if(int(s.split(':')[0]) < int(t.split(':')[0])):
	h = int(s.split(':')[0]) + 24 - int(t.split(':')[0])
else:
	h = int(s.split(':')[0]) - int(t.split(':')[0])
if(int(s.split(':')[1]) < int(t.split(':')[1])):
	h -= 1
	m = int(s.split(':')[1]) + 60 - int(t.split(':')[1])
else:
	m = int(s.split(':')[1]) - int(t.split(':')[1])
 
if(h < 10):
	p = "0" + str(h)
else:
	p = str(h)
if(m < 10):
	p += ":0" + str(m)
else:
	p += ":" + str(m)

print("Current time: " + s)
print("Sleep time: " + t)
print("Sleep start: " + p)