Clock

import math;
import sys;
hours = int(input())
minutes = int(input())
totalminutes=hours*60+minutes+15
from math import floor
if(totalminutes/60>0):
    from math import floor
    finalhour=floor(totalminutes/60)
    finalminutes= totalminutes-finalhour*60
    if finalhour>=24:
        finalhour-=24
if finalminutes<10:
    print(f"{finalhour}:0{finalminutes}")
else:
    print(f"{finalhour}:{finalminutes}")