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

namespace _05Stop
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine(new string('.', n + 1) + new string('_', n * 2 - n / 2 + 4) + new string('.', n + 1));
            for (int i = 0; i < n ; i++)
            {
                Console.WriteLine(new string('.', n - 1 * i) + "//" + new string('_', n * 2 - n / 2 + 2 + i * 2) + "\\\\" +
                                  new string('.', n - 1 * i));
            }
            Console.WriteLine("//" + new string('_', 2 * n - n / 2 ) + "STOP!" + new string('_', 2 * n - n / 2 ) + "\\\\");

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

        }
    }
}