using System;
using System.Collections.Generic;
using System.Linq;

namespace _0446
{
    class Program
    {
        static void Main(string[] args)
        {
            var t = Console.ReadLine();
            DateTime time = DateTime.Parse(t);
            time = time.AddMinutes(5);

            Console.WriteLine("{0:00}:{1:00}", time.Hour, time.Minute);
        }
    }
}