import java.util.*;

class Main {
   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      while (true) {
         int H = Integer.parseInt(sc.next());
         int W = Integer.parseInt(sc.next());
         if ((H > 300 || W > 300) || (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)) {
                  System.out.print("#");
               } else {
                  System.out.print(".");
               }
            }
            System.out.println();
         }
         System.out.println();
      }
   }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz