Square

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

namespace Square
{
    class Sqare
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine(new string('*',n));
            for (int row = 0; row < n-2; row++)
            {
                Console.Write("*");
                Console.Write(new string('-',n-2));
                Console.WriteLine("*");
            }
            Console.WriteLine(new string('*',n));
        }
    }
}