#include <bits/stdc++.h>
using namespace std;
int main() {
  int W, H;
  while (1) {
    cin >> W >> H;
    if (W == 0 && H == 0) break;
    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 << "\n";
    }
    cout << endl;
  }
  return 0;
}
