#include <iostream>
using namespace std;
int main() {
	int h, w;
	while (cin >> h >> w && (h != 0 && w != 0)) {
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				if (i == 0 || i == h-1 || j == 0 || j == w-1) {
					cout << "#";
				} else {
					cout << ".";
				}
			}
			cout << endl;
		}
		cout << endl;
	}
}