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 a = new DateTime(2000,1,1,hh,mm,0);
        var b = a +  new TimeSpan(0, 5, 0);
        Console.WriteLine("{0:00}:{1:00}",b.Hour,b.Minute);
    }
}