using System;

public class Program

{

    public static void Main()

    {

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

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

        minutes += 15;

        if (minutes >= 60)

        {

            hours = hours + 1;

            minutes -=60;

        }

        if (hours == 24)

        {

            hours = 0;

        }

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

    }

}