using System;

public class Hello
{
    public static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(':');
        var hh = int.Parse(line[0]);
        var mm = int.Parse(line[1]);
        var cf = false;
        mm += 5;
        if (mm >= 60) { mm %= 60;  cf = true; }
        if (cf) hh++;
        if (hh == 24) hh = 0;
        Console.WriteLine("{0:00}:{1:00}",hh,mm);
    }
}