Square-Frame

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

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

            for (int i = 1; i <= n - 2; i++)
            {
                Console.Write("+ ");
                Console.Write(new string('-', n - 2));
                Console.Write(" +");

                for (int mid = 1; mid <= n - 2; mid++)
                {

                    Console.WriteLine();
                    Console.Write("| ");
                    Console.Write(new string('-', n - 2));
                    Console.Write(" |");

                }
                Console.WriteLine();
                Console.Write("+ ");
                Console.Write(new string('-', n - 2));
                Console.Write(" +");

                Console.WriteLine();
            }

        }

    }
}