using System;

class TimePlus15Minutes
{
    static void Main()
    {
        var chas = int.Parse(Console.ReadLine());
        var min = int.Parse(Console.ReadLine());

        var suma = ((chas * 60) + min + 15);
        var resultchas = suma / 60;
        if (resultchas >= 24)
        {
            resultchas -= 24;
        }
        var resultmin = suma % 60;

        Console.WriteLine("{0}:{1:00}", resultchas, resultmin);
    }
}