import java.util.Scanner;

public class Main {
	private static Scanner sc;

	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int H = sc.nextInt();
		int W = sc.nextInt();
		
		while (H != 0 && W != 0) {
			display(H, W);
			H = sc.nextInt();
			W = sc.nextInt();
		}
	}

	private static void display(int h, int w) {
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				if (j == 0 || j == (w - 1)) {
					System.out.print("#");
				} else {
					if (i == 0 || i == (h - 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