timePlus15

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

namespace TimePlus15
{
    class Program
    {
        static void Main(string[] args)
        {
            int startHour = int.Parse(Console.ReadLine());
            int startMinutes = int.Parse(Console.ReadLine());

            int allInMinutes = startHour * 60 + startMinutes;
            int timePlus = allInMinutes + 15;

            int finalHour = timePlus / 60;
            int finalMintes = timePlus%60;
            if (finalHour==24)
            {
                finalHour = 0;
            }
            if (finalMintes<10)
            {
                Console.WriteLine(finalHour+":"+"0"+finalMintes);
            }
            else
            {
                Console.WriteLine(finalHour+":"+finalMintes);
            }
        }
    }
}