SqareOfStars

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

namespace HomeWorkCoding101
{
    class SqareOfStars
    {
        static void Main(string[] args)
        {
            //First part
            int N = int.Parse(Console.ReadLine());

            //Write the first row
            string row = new string('*' , N);
            Console.WriteLine(row);

            //Write inner rows
            for(int times = 0; times < N - 2; times++)
            {
                //string currentRow = "*" + new string(' ', N - 2) + "*";
                //Console.WriteLine(currentRow);

                string spaces = new string(' ' , N - 2);
                Console.WriteLine("*{0}*" , spaces);
            }

            //Write the first row again
            Console.WriteLine(row);

        }
    }
}