import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		while (true) {
			int H = Integer.parseInt(sc.next());
			int W = Integer.parseInt(sc.next());

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

			for (int i = 0; i < H; i++) {

				if (i == 0 || i == H - 1) {

					for (int j = 0; j < W; j++) {
						System.out.print("#");
					}
					System.out.print("\n");
				} else {
					System.out.print("#");
					for (int j = 0; j < W - 2; j++) {
						System.out.print(".");
					}

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

	}
}
/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