Time + 15 Minutes

# Time + 15 Minutes
hours = int(input())
minutes = int(input())

total_minutes = hours * 60 + minutes + 15

hours = total_minutes // 60
minutes = total_minutes % 60

if hours >= 24:
    hours -= 24

print(f'{hours}:', end='')

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