using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
class Array
{
    static void Main(string[] args)
    {
        int sideLength = int.Parse(Console.ReadLine());
        Console.WriteLine(new string('*', sideLength));
        for (int i = 0; i < sideLength - 2; ++i)
        {
            Console.Write("*");
            for (int j = 0; j < sideLength - 2; ++j)
            {
                Console.Write(" ");
            }
            Console.Write("*");
            Console.WriteLine();
        }
        Console.WriteLine(new string('*', sideLength));
    }
}