using System;

public class Program

{

    public static void Main()

    {

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

        int minutes=int.Parse(Console.ReadLine()); 

        minutes+=hours*60+15; 

        hours=minutes/60;

        minutes=minutes%60;

        if (hours==24) 

        {

            Console.WriteLine($"{0}:{minutes:d2}");

        }

        else 

        {

            Console.WriteLine($"{hours}:{minutes:d2}");

        }

    }

}