hour, minute = list(map(int, input().split(':')))

minute += 5

if minute >= 60:
    hour += 1
    minute -= 60

if hour >= 24:
    hour -= 24

if hour < 10:
    hour = '0' + str(hour)
else:
    hour = str(hour)

if minute < 10:
    minute = '0' + str(minute)
else:
    minute = str(minute)

print(hour + ':' + minute)