import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        StringBuilder Newbuilt = new StringBuilder(); //????????´?????????????????????
      //H??¨W?????\?????????????????????????????§???  
        while (true) {
            String[] array = sc.nextLine().split(" ");
            int H = Integer.parseInt(array[0]);
            int W = Integer.parseInt(array[1]);
            if (H == 0 && W == 0) break ;
      //????????¢?????¢???????¨???????????????¶ HxW
            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)
                        Newbuilt.append("#");
                    else
                        Newbuilt.append(".");

                }
                Newbuilt.append("\n");
            }
            Newbuilt.append("\n");
             
        }
       //StringBuilder????????????????????????????????????????????????????????????
        System.out.print(Newbuilt);
        
        sc.close();
    }
}
/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