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());
            Console.WriteLine(new string('.', n + 1) + new string('_', n * 2 + 1) + new string('.', n + 1));
            for(int i =0;i<n;i++)
            {
                Console.WriteLine(new string('.',n-i)+"//"+new string('_',n*2+(-1+2*i))+"\\\\"+new string('.',n-i));
            }
            Console.WriteLine("//"+new string('_',((n*4+3)-9)/2)+"STOP!"+new string('_',((n*4+3)-9)/2)+"\\\\");
            for (int i = n, j = 2, k = 0; i > 0; i--, j++, k++)
            {
                Console.WriteLine(new string('.', n - i) + "\\\\" + new string('_', ((n * 4) + 3) - j * 2) + "//" + new string('.', n - i));
            }
        }
    }
}