using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Time_15Minutes
{
    class Program
    {
        static void Main(string[] args)
        {
            int hours = int.Parse(Console.ReadLine());
            int minutes = int.Parse(Console.ReadLine());
            int allMinutes = minutes + 15 + hours * 60;
            int totalHours = allMinutes / 60;
            minutes = allMinutes - totalHours * 60;
            if (totalHours == 24)
            {
                totalHours = 0;
            }
            Console.WriteLine($"{totalHours}:{minutes:D2}");
        }
    }
}