#include<iostream>
using namespace std;
int main(){
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++)
		cout << "*";
	cout << endl;
	for (int j = 1; j <= n; j++){
		cout << "*";
		for (int p = 1; p <= n - 2; p++)
			cout << " ";
		cout << "*";
		cout << endl;
	}
	for (int i = 1; i <= n; i++)
		cout << "*";
	return 0;
}