minutes

using System;

namespace _03.Time_15Minutes
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int hourss = int.Parse(Console.ReadLine());
            int minutess = int.Parse(Console.ReadLine());

            minutess += 15;

            if (minutess >= 60)
            {
                minutess -= 60;
                hourss += 1;
            }

            if (hourss == 24)
            {
                hourss = 0;
            }

            Console.WriteLine($"{hourss}:{minutess:D2}");
        }
    }
}