STOP!

using System;

namespace Stop
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            var dots = n + 1;
            var dash = 2 * n + 1;
            var up = new string('.', dots) + new string('_', dash) + new string('.', dots);
            Console.WriteLine(up);
            dots--;
            dash -= 2;
            for (int i = 0; i < n; i++)
            {
                var mid = new string('.', dots) +"//"+ new string('_', dash) +"\\\\"+ new string('.', dots);
                Console.WriteLine(mid);
                dots--;
                dash += 2;
            }
            var singStop = "STOP!";
            var stop = "//" + new string('_', (dash-5)/2) + singStop + new string('_', (dash - 5) / 2)+"\\\\";
            Console.WriteLine(stop);
            for (int i = 0; i < n; i++)
            {
                var down = new string('.', dots) + "\\\\" + new string('_', dash) + "//" + new string('.', dots);
                Console.WriteLine(down);
                dots++;
                dash -= 2;
            }
        }
    }
}