using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        string[] T = Console.ReadLine().Split(':');
        int minute = int.Parse(T[1]) + 5;
        int hour = int.Parse(T[0]);

        if (60 <= minute)
        {
            hour += 1;
            minute -= 60;
        }
        if (24 <= hour) { hour -= 24; }

        Console.WriteLine("{0:00}:{1:00}", hour, minute);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}