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

namespace _02SoftuniCoffeeOrders
{
    class SoftuniCoffeeOrders
    {
        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(' ', n - 2) + '*');
            }
            Console.WriteLine(new string('*', n));
        }
    }
}