TimePlus15Min

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

namespace TimePlus15Mins
{
    class Program
    {
        static void Main(string[] args)
        {

            var H = int.Parse(Console.ReadLine());
            var M = int.Parse(Console.ReadLine());

            var min = M + 15;

            if (min > 59)
            {
                H = H + 1;
                min = min - 60;
            }

            if (H >= 24)
            {
                H = H - 24;
            }

            Console.WriteLine("{0}:{01:00}", H, min);

        }
    }
}

// var sec1 = int.Parse(Console.ReadLine());
// var sec2 = int.Parse(Console.ReadLine());

// var sec3 = int.Parse(Console.ReadLine());
// var secs = sec1 + sec2 + sec3;
// var mins = secs / 60;
// secs = secs % 60;
// Console.WriteLine("{0}:{1}", mins, secs.ToString().PadLeft(2, '0'));