05. Time + 15 Minutes

hour = int(input())
minutes = int(input())
total_time = hour * 60 + minutes + 15
sum_hour = total_time // 60
sum_minutes = total_time % 60

if sum_hour == 24:
    sum_hour = 0

if sum_minutes < 10:
    print(f"{sum_hour}:0{sum_minutes}")
else:
    print(f"{sum_hour}:{sum_minutes}")