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- #include<bits/stdc++.h>
- using namespace std;
- int main() {
- int h, w, z = 0;
- while (cin >> h >> w) {
- if (h == 0 and w == 0)
- break;
- if (z++)
- cout << endl;
- for (int x = 0; x < h; x++) {
- for (int y = 0; y < w; y++) {
- if (x == 0 || x == h - 1 || y == 0 || y == w - 1)cout << "#";
- else cout << ".";
- }
- cout << endl;
- }
- }
- return 0;
- }
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