using System;

namespace _1._Stars
{
    class Program
    {
        static void Main()
        {

            int n = int.Parse(Console.ReadLine());
            Console.WriteLine(new string ('*', n));
            for (int i = 0; i < n - 2; i++)
            {
                Console.WriteLine("*{0}*", new string(' ', n - 2));
            }

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

        }
    }
}