class Program
{
    static void Main(string[] args)
    {
        string input = Console.ReadLine()!;
        TimeSpan firstTime = TimeSpan.Parse(input);

        int hour = firstTime.Hours;
        int minute = firstTime.Minutes;
        minute += 5;

        if (minute >= 60)
        {
            minute -= 60;
            hour += 1;
        }

        if (hour == 24)
        {
            hour = 0;
        }
        Console.WriteLine(String.Format("{0:00}",hour) + ":" + String.Format("{0:00}",minute));
    }
}