SquareOfStars

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

namespace Test
{
    class SquareStars
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

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

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

            Console.WriteLine(firstRow);

        }
    }
}