import java.io.*;

class Main {
	public static void main(String[] args)  throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		boolean end = false;

		while (end == false) {
			// ??\?????????????????????
			String temp = br.readLine();
			String[] numbers = temp.split(" ");// ????????¨??????????????????
			int H = Integer.parseInt(numbers[0]);
			;// ??????
			int W = Integer.parseInt(numbers[1]);
			;// ???

			if (H >= 3 || W <= 100 && H > 0 && W > 0) {
				// ????§???¢??????????????????
				for (int i = 0; i < H; i++) {

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

					System.out.println();// ?¬??????????
				}
				System.out.println();// ??????

			} else if (H == 0 && W == 0) {
				end = true;// HW?????????0??????????????????
			}
		}


	}
}
/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