using System;
using System.Collections.Generic;
using System.Linq;
    class Program
    {

        static void Main(string[] args)
        {
            var line = Console.ReadLine().Split(':');
            var hour = int.Parse(line[0]);
            var minute = int.Parse(line[1]);
            var time = new TimeSpan(hour,minute,00);
            time = time.Add(TimeSpan.FromMinutes(5));
            Console.WriteLine("{0:D2}:{1:D2}",time.Hours, time.Minutes);
        }
    }