using System;

public class Program

{

    public static void Main(string[] args)

    {

        var mins = int.Parse(Console.ReadLine());

        var hours = int.Parse(Console.ReadLine());

        mins = 15 + mins;

    if (mins > 59)

    {

    mins = mins %60;    

    }   

    if (hours > 23)

    {

    hours = hours %24;

    }

    if (mins < 10)  

    {

    Console.WriteLine(hours + ":" + "0" + mins);

    }

    else

    {   

    Console.WriteLine(hours + "0" + mins);

    }

    }

}