TimePlus15Minutes

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

namespace Test
{
    class TimePlus15Minutes
    {
        static void Main()
        {
            int hours = int.Parse(Console.ReadLine());
            int min = int.Parse(Console.ReadLine());
            TimeSpan tms = new TimeSpan(hours , min + 15 , 0);
            Console.WriteLine("{0:%h}:{0:mm}", tms);
        }
    }
}