Time + 15 minutes

hour = int(input())
minutes = int(input())
timer = minutes+15

if timer < 60:
  hour = hour
  minutes = timer
elif timer >=60:
  hour = hour + timer // 60
  minutes = timer % 60

if hour == 24:
  hour=0

print(f"{hour}:0{minutes}" if minutes<10 else f"{hour}:{minutes}")