import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        while (true) {
            int H = scan.nextInt(), W = scan.nextInt();
            if (H == 0 && W == 0) {
                break;
            }

            for (int h = 0; h < H; h++) {
                if (h == 0 || h == H - 1) {
                    for (int w = 0; w < W; w++) {
                        System.out.print("#");
                    }
                } else {
                    System.out.print("#");
                    for (int i = 0; i < W - 2; i++) {
                        System.out.print(".");
                    }
                    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