# coding: utf-8

import math
mix= input().split()
h=int(mix[0])
m=int(mix[1])
zure=float(mix[2].replace("UTC",""))-9
lzu = math.floor(zure)
szu = (zure-lzu)*60
mm = int(m+szu)
if mm < 0:
    mm+=60
    h-=1
elif mm>60:
    mm-=60
    h+=1
else:
    pass
if 0<=mm<=9:
    mmm="0"+str(mm)
else:
    mmm=str(mm) 
hh=h+lzu
if hh>24:
    hh-=24
elif hh<0:
    hh+=24
if 0<=hh<=9:
    hhh="0"+str(hh)
else:
    hhh=str(hh)
print(hhh+":"+mmm)