Stop

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

namespace Stop
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int counter = 0;
            //first row
            Console.WriteLine("{0}{1}{0}", new string('.',n+1),new string('_',n*2+1));

            //middle
            for (int i = 0; i < n; i++)
            {
                for (int y = n; y > i; y--)
                {
                    Console.Write(".");
                }
                counter++;
                Console.Write("//{0}\\\\",new string('_',n*2+counter-2));
                counter++;
                for (int y = n; y > i; y--)
                {
                    Console.Write(".");
                }
                Console.WriteLine();
            }

            //stop sign
            Console.WriteLine("//{0}STOP!{0}\\\\",new string('_',n * 2-3));

            //bottom part
            for (int i = 0; i < n; i++)
            {
                for (int y = 0; y < i; y++)
                {
                    Console.Write(".");
                }
                counter--;
                Console.Write("\\\\{0}//", new string('_', n * 2 + counter ));
                counter--;
                for (int y = 0; y < i; y++)
                {
                    Console.Write(".");
                }
                Console.WriteLine();
            }

        }
    }
}