

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner in = new Scanner(System.in);

		while (true) {

			// ????????¢????????¨?¨????????????\???
			int height = in.nextInt();
			int width = in.nextInt();

			// ??\?????????(0,0)??????????????????
			if (height == 0 && width == 0) {
				break;
			} else {

				// ?????????????????°??????????????????
				for (int count_h = 0; count_h < height; count_h++) {

					if(count_h == 0 || count_h == (height-1)) {

						// ?¨???????????????°??????#?????¨???
						for (int count_w = 0; count_w < width; count_w++) {

							System.out.print("#");
						}

					}else{
						System.out.print("#");

						for (int count_w = 0; count_w < (width-2); count_w++) {

							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