using System;

class Program
{
    static void Main()
    {
        var hour = int.Parse(Console.ReadLine());
        var minutes = int.Parse(Console.ReadLine());

        TimeSpan span = new TimeSpan(hour, minutes, 0);
        TimeSpan span2 = new TimeSpan(0, 15, 0);
        TimeSpan total = span + span2;

        Console.WriteLine("{0:h\\:mm}", total);
    }
}