using System;
class TimeMinutes
{
    static void Main(string[] args)
    {
        var hour = int.Parse(Console.ReadLine());
        var minutes = int.Parse(Console.ReadLine());
         minutes = minutes + 15;
        if (minutes >= 60)
        {
            hour = hour + 1;
            minutes = minutes - 60;

            if (hour >= 24)

                hour = hour - 24;
        }
        Console.WriteLine("{0}:{01:00}", hour, minutes);

    }

}