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

namespace StopSign
{
    class StopSign
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            Console.WriteLine(new string('.', n + 1) + new string('_',  n +2) + new string('.', n + 1));

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

            var stop = "STOP!";
            Console.WriteLine(new string('/', 2) + new string('_', (3*n-stop.Length) / 2) + stop
                + new string('_', (3*n-stop.Length) / 2 + (n+1) % 2) + new string ('\\', 2));

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


            }
        }
    }
}