# coding=utf-8

from math import modf


list = input().split()
hour = int(list[0])
minutes = int(list[1])
utc = str(list[2])

d = str(utc[3])
set = float(utc[3:])

diff = round((9 - set), 1)
diff_m, diff_h = modf(diff)
diff_m = round(diff_m, 1)

hour = hour - int(diff_h)
minutes = minutes - int(diff_m * 60)

if minutes >= 60:
    minutes = minutes - 60
    hour += 1
elif minutes < 0:
    minutes = 60 + minutes
    hour -= 1


if hour >= 24:
    hour = hour - 24
elif hour < 0:
    hour = 24 + hour

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

if minutes < 10:
    minutes = str('0' + str(minutes))

print(str(hour) + ':' + str(minutes))