using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Program
{
    static void Main()
    {
        new Magatro().Solve();
    }
}

class Magatro
{
    private int H, M;

    private void Scan()
    {
        var line = Console.ReadLine().Split(':');
        H = int.Parse(line[0]);
        M = int.Parse(line[1]);
    }

    public void Solve()
    {
        Scan();
        M += 5;
        if (M >= 60)
        {
            M -= 60;
            H++;
        }
        if (H >= 24)
        {
            H -= 24;
        }
        Console.WriteLine("{0:D2}:{1:D2}", H, M);
    }
}