take pair number, print decorated box

import java.util.*;

public class Chie13115168098 {
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int h = 0;
    int w = 0;
    StringBuilder sb = new StringBuilder();
    while (true) {
      try {
        if (in.hasNext()) { h = new Integer(in.next()); }
        if (in.hasNext()) { w = new Integer(in.next()); }
      }
      catch (Exception e) {
        in.close(); System.exit(1);
      }
      if (h == 0 || w == 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) {
            sb.append("#");
          }
          else {
            sb.append(".");
          }
        }
        sb.append("\n");
      }
      sb.append("\n");
    }
    System.out.print(sb);
  }
}