TimePlus15

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 hour = int.Parse(Console.ReadLine());
            int minutes = int.Parse(Console.ReadLine());
            int hourInMInutes = hour * 60;

            int totalMinutes = hourInMInutes + minutes;
            int minutesPlus15 = totalMinutes + 15;

            int newHour = minutesPlus15 / 60;
            int newMinutes = minutesPlus15 % 60;
            if(newHour == 24)
            {
                newHour = 0;
            }

            Console.WriteLine("{0}:{1:00}",newHour,newMinutes);
        }
    }
}