using System;
using System.Threading;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int h = 0; h <= 23; h++)
            {
                for (int min = 0; min < 59; min++)
                {
                    for (int sec = 0; min < 59; sec++)
                    {
                        Console.Write($"{h:d2}:{min:d2}:{sec:d2}");
                        Thread.Sleep(1000);
                        Console.Write("\r");
                    }

                }
            }


        }
    }
}