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

namespace template
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] x = Console.ReadLine().Split(':').Select(int.Parse).ToArray();
            TimeSpan ts1 = new TimeSpan(x[0], x[1], 0);
            TimeSpan ts2 = new TimeSpan(0, 5, 0);
            ts1 += ts2;
            Console.Write(ts1.Hours < 10 ? "0" + ts1.Hours.ToString() : ts1.Hours.ToString());
            Console.WriteLine(ts1.Minutes < 10 ? ":0" + ts1.Minutes.ToString() : ":" + ts1.Minutes.ToString());
        }
    }
}