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

namespace Coding_101_24._04._2016
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            int spot = n + 1;
            int mid = 2 * n - 1;
            Console.Write(new string('.', spot));
            Console.Write(new string('_', 2 * n + 1));
            Console.WriteLine(new string('.', spot));
            spot--;
            for (int i = 0; i < n + 1; i++)
            {
                if (i == n)
                {
                    Console.Write(new string('.', spot));
                    Console.Write("//");
                    Console.Write(new string('_', (mid - 5) / 2));
                    Console.Write("STOP!");
                    Console.Write(new string('_', (mid - 5) / 2));
                    Console.Write(@"\\");
                    Console.WriteLine(new string('.', spot));
                }
                else
                {
                    Console.Write(new string('.', spot));
                    Console.Write("//");
                    Console.Write(new string('_', mid));
                    Console.Write(@"\\");
                    Console.WriteLine(new string('.', spot));
                }
                spot--;
                mid += 2;
            }
            spot++;
            mid -= 2;
            for (int i = n ; i > 0; i--)
            {
                Console.Write(new string('.', spot));
                Console.Write(@"\\");
                Console.Write(new string('_', mid));
                Console.Write("//");
                Console.WriteLine(new string('.', spot));
                spot++;
                mid -= 2;
            }
        }
    }
}