STOP

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

namespace Stop
{
    class Stop
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int leftRight = n + 1;
            Console.WriteLine("{0}{1}{0}", new string('.', leftRight), new string('_', 2 * n + 1));
            for (int i = 0; i < n; i++)
            Console.WriteLine("{0}//{1}\\\\{0}", new string('.', n - i), new string('_', 2 * (n + i) - 1));
            Console.WriteLine("//{0}STOP!{0}\\\\", new string('_', 2 * n - 3));
            Console.WriteLine("\\\\{0}//", new string('_', 4 * n - 1));
            for (int i = n - 1; i >= 1; i--)
            Console.WriteLine("{0}\\\\{1}//{0}", new string('.', n - i), new string('_', 2 * (n + i) - 1));
        }
    }
}