#include <iostream>

using namespace std;

void f(int n, int a) {
	for (int i = 0; i < a; ++i) {
		cout << "*";
	}
	for (int i = 0; i < n - 2 * (a - 1); ++i) {
		cout << ".";
	}
	for (int i = 0; i < a; ++i) {
		cout << "*";
	}
	cout << endl;
	if (a - 1 == n / 2) {
		return;
	}
	f(n, ++a);
	for (int i = 0; i < a - 1; ++i) {
		cout << "*";
	}
	for (int i = 0; i < n - 2 * (a - 2); ++i) {
		cout << ".";
	}
	for (int i = 0; i < a - 1; ++i) {
		cout << "*";
	}
	cout << endl;
}

int main() {
	int n, a = 1;
	cin >> n;
	f(n, a);
	cout << endl;
}