// おもろい
#include <iostream>
#include <vector>
#define rep(i, n) for(i = 0; i < n; i++)
using namespace std;

int main() {
	int n;
	cin >> n;

	vector<vector<int>> a(n, vector<int>(n));
	for (int i = 0; i < n - 1; i++) {
		a[i][n - 1 - i] = 1;
		a[i][n - 2 - i] = 1;
	}

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (a[i][j]) cout << "#";
			else cout << ".";
		}
		cout << endl;
	}
	return 0;
}