#include <iostream>

using namespace std;
int main()
{

    int n;
    cin >> n;

    for (int i = 0; n > i ; i++)
    {

        if (i == 0 | i == n-1)
        {
            for (int j = 0; n > j ; j++)
                cout << "*";
        }
        else
        {
            for(int q = 0; n > q ; q++)
            {
                if(q == 0| q == n-1)
                    cout << "*";
                else
                    cout << " ";
            }
        }


        cout << "\n";
    }

    return 0;

}