import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

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

		while (true) {
			String[] inputNum = br.readLine().split(" ");
			int H = Integer.parseInt(inputNum[0]);
			int W = Integer.parseInt(inputNum[1]);

			if (H == 0 && W == 0) {
				break;
			}

			for (int i = 1; i <= H; i++) {
				for (int j = 1; j <= W; j++) {
					if (i == 1 || i == H || j == 1 || j == W) {
						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