using System;
public class Hello{
    public static void Main(){
        // Here your code !
        //int a;
         //a = int.Parse(Console.ReadLine()); //?¨??????\???
        TimeSpan ts =  TimeSpan.Parse(Console.ReadLine());
        TimeSpan ts2 = new TimeSpan(0, 5, 0);
        ts =ts+ts2;
        //System.Console.WriteLine(ts.Hours+":"+ts.Minutes+":"+ts.Seconds);
        Console.WriteLine(ts.ToString("hh':'mm"));
    }

}