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

namespace YukiCoder_Cs
{
    class Program
    {
        public static void Main()
        {
            var line = Console.ReadLine().Split(':').Select(s => int.Parse(s)).ToArray();
            var tm = new DateTime(2017, 6, 14, line[0], line[1], 0);


            Console.WriteLine($"{tm.AddMinutes(5):HH:mm}");
        }
    }
}