import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int H, W;
		while (sc.hasNextLine()) {
			String[] str = sc.nextLine().split(" ");
			H = Integer.parseInt(str[0]);
			W = Integer.parseInt(str[1]);
			if (H == 0 && W == 0)
				break;
			for (int y = 0; y < H; y++) {
				for (int x = 0; x < W; x++) {
					if (y == 0 || y == H - 1 || x == 0 || x == W - 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