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.
#!/usr/bin/python3
current = str(input())
sleepingDur = str(input())

H1 = int(current[0:2])
M1 = int(current[3:5])

H2 = int(sleepingDur[0:2])
M2 = int(sleepingDur[3:5])

if H2>H1:
    H1+=24
if M2>M1:
    M1+=60
sleepingTime = 0
if (H1-H2)<10:
    sleepingTime = "0"+str((H1-H2))+":"
else:
    sleepingTime = str((H1-H2))+":"

if (M1-M2)<10:
    sleepingTime = sleepingTime + "0"+str((M1-M2))
else:
    sleepingTime = sleepingTime + str((M1-M2))
print(sleepingTime)
