using System;

public class Program

{

    public static void Main()

    { 

        {

            var a = int.Parse(Console.ReadLine());

            Console.WriteLine(new string('*', a));

​

            for (int i = 0; i < a - 2; i++)

                Console.WriteLine(new string('*', 1) + new string(' ', a - 2) + new string('*', 1));

​

            Console.WriteLine(new string('*', a));

        }

    }

}