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 t = Console.ReadLine();

            var time = TimeSpan.Parse(t + ":00");
            time = time.Add(new TimeSpan(0, 5, 0));

            Console.WriteLine(time.ToString(@"hh\:mm"));
        }
    }
}