

import java.util.*;

public class Main {
	public static void main(String args[]) {
		Scanner scan = new Scanner(System.in);
		StringBuilder sb = new StringBuilder();
		int h, w;

		while (true) {
			h = scan.nextInt();
			w = scan.nextInt();
			// h??¨w???0????????£?????¨???????????????
			if ((h == 0) & (w == 0)) {
				break;
			}

			// ????????????????????????
			for (int count = 0; count < h; count++) {
				// ?¨??????????????????????
				for (int count2 = 0; count2 < w; count2++) {
					// ???????????????????????¨????????????True???#??????????????????????????¶???
					if ((count == 0) | (count == (h - 1))) {
						sb.append("#");
					} else {
						// ?¨?????????????????????¨?????????True???#?????????)??????????????¶???
						if ((count2 == 0) | (count2 == (w - 1))) {
							sb.append("#");
						} else {
							sb.append(".");
						}
					}
				}
				sb.append("\n");
			}

			System.out.println(new String(sb));
			// StringBuilder???????????????
			sb.delete(0, sb.length());

		}

	}
}
/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