03. Time + 15 Minutes

init_hour = int(input())
init_minutes = int(input())

total_time = (init_hour * 60) + init_minutes + 15

hours = total_time // 60
minutes = total_time % 60

if hours > 23:
    hours = 0

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