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 underLine = n * 2 - 1;
            int dots = n;
            string leftDash = "//";
            string rightDash = @"\\";
            Console.WriteLine("{0}{1}{0}", new string('.', n + 1), new string('_', n * 2 + 1));
            for (int i = 0; i < n * 2; i++)
            {
                Console.WriteLine(@"{0}{1}{2}{3}{0}", new string('.', dots), leftDash, new string('_', underLine), rightDash);

                if (i == n - 1)
                {
                    Console.WriteLine(@"{0}{1}STOP!{1}{2}", leftDash, new string('_', underLine / 2 - 1), rightDash);
                    leftDash = @"\\";
                    rightDash = "//";
                }
                if (i >= n)
                {
                    underLine -= 2;
                    dots++;
                }
                else
                {
                    underLine += 2;
                    dots--;
                }
            }
        }
    }
}