12. Time +15 Minutes

using System;

namespace _12.Time_15Minutes
{
    class Program
    {
        static void Main()
        {
            int hours = int.Parse(Console.ReadLine());
            int minutes = int.Parse(Console.ReadLine());
            minutes = minutes + 15;

            if (minutes > 59)
            {
                minutes = minutes - 60;
                hours = hours + 1;
            }

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

            Console.WriteLine($"{hours}:{minutes:0#}");
        }
    }
}