using System;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            DateTime t = DateTime.Parse(s);
            t += new TimeSpan(0,5,0);
            Console.WriteLine(t.Hour.ToString("00") + ":" + t.Minute.ToString("00"));
        }
    }
}