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

namespace _06SquareOfStars
{
    class ScuareOfStars
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            Console.WriteLine(new string('*', n));

            for (int i = 0; i < n - 2; i++)
                Console.WriteLine(new string('*', 1) + new string(' ', n - 2) + new string('*', 1));

            Console.WriteLine(new string('*', n));
        }

    }

}