a=int(input())
hour=a//100
minute=(a-hour*100)*3//5
minute_new= f'{minute:02}'
if 0<hour<14:
    b=hour+10
    print(b,minute_new, sep=":")
elif 14<=hour:
    hour1=(hour-14)//24
    hour_new=hour-14-24*hour1
    hour_new_new= f'{hour_new:02}'
    print(hour_new_new,minute_new, sep=":")
else:
    print("10",minute_new, sep=":")