using System;

namespace Time_15_Minutes
{
    class Program
    {
        static void Main(string[] args)
        {
            int hours = int.Parse(Console.ReadLine());
            int minutes = int.Parse(Console.ReadLine());

            int hoursInMinutes = hours*60;
            int minutesPlus15 = hoursInMinutes + minutes + 15;

            int hoursAfter15 = minutesPlus15 / 60;
            int minutesAfter15 = minutesPlus15 % 60;

            if (hoursAfter15 == 24)
            {
                hoursAfter15 = 0;
            }

            Console.WriteLine($"{hoursAfter15}:{minutesAfter15:D2}");
        }
    }
}