using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] input = Console.ReadLine().Split(':');
            int hour = int.Parse(input[0]);
            int min = int.Parse(input[1]);
            min = min + 5;
            if(min>59)
            {
                min = min - 60;
                hour++;
            }
            if(hour>23)
            {
                hour = hour - 24;
            }
            Console.WriteLine("{0:00}" + ":" + "{1:00}", hour, min);
        }
    }
}