hour, min = map(lambda x: int(x), input().split(":"))

min += 5

min_overflaw = True if min >= 60 else False
if min_overflaw: hour += 1 ; min -= 60

hour_overflaw = True if hour >= 24 else False
if hour_overflaw: hour = 0

hour = '%02d' % hour; min = '%02d' % min
print(hour +":"+ min)