题解 | 小乐乐定闹钟

numbers = str(input())

hour_minute, k = map(str, numbers.split())

def compute(hour_minute, k):
    orign_hour = int(hour_minute.split(":")[0])
    orign_minute = int(hour_minute.split(":")[1])

    k = int(k)
    add_hour = k // 60
    add_minute = k % 60
    
    new_hour = orign_hour + add_hour
    new_minute = orign_minute + add_minute

    if new_minute >= 60:
        new_hour += 1
        display_minute = new_minute - 60 
        display_hour = new_hour % 24
    else:
        display_minute = new_minute
        display_hour = new_hour % 24


# 如果是0-9点，显示为0X格式
    if display_hour <= 9 and display_minute <= 9:
        return f"0{display_hour}:0{display_minute}"
    elif display_hour <= 9 and display_minute >= 10:
        return f"0{display_hour}:{display_minute}"
    else:
        return f"{display_hour}:{display_minute}"

print(compute(hour_minute, k))