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.
import sys
wake=raw_input()
sleep_time=raw_input()
wh1=int(wake[0])-int('0')
wh2=int(wake[1])-int('0')
wh=(10*wh1)+wh2
wm1=int(wake[3])-int('0')
wm2=int(wake[4])-int('0')
wm=(10*wm1)+wm2
sh1=int(sleep_time[0])-int('0')
sh2=int(sleep_time[1])-int('0')
sh=(10*sh1)+sh2
sm1=int(sleep_time[3])-int('0')
sm2=int(sleep_time[4])-int('0')
sm=(10*sm1)+sm2
if(wh-sh>=0):
    if(wh-sh<10):
        print(0),
        sys.stdout.softspace=False;
    print(wh-sh),
    sys.stdout.softspace=False;
else:
    if(24+(wh-sh)<10):
        print(0),
        sys.stdout.softspace=False;
    print(24+(wh-sh)),
    sys.stdout.softspace=False;
print(":"),
sys.stdout.softspace=False;
if(wm-sm>=0):
    if(wh-sh<10):
        print(0),
        sys.stdout.softspace=False;
    print(wm-sm),
    sys.stdout.softspace=False;
else:
    if(60+(wm-sm)<10):
        print(0),
        sys.stdout.softspace=False;
    print(60+(wm-sm))
    sys.stdout.softspace=False;
