import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int H;
        int W;
        while ((H = scanner.nextInt()) != 0 && (W = scanner.nextInt()) != 0) {
            for (int h = 0; h < H; h++) {
                if (h == 0 || h == H-1) {
                    for (int w = 0; w < W; w++) {
                        System.out.print('#');
                    }
                } else {
                    for (int w = 0; w < W; w++) {
                        char c = '.';
                        if (w == 0 || w == W-1) c = '#';
                        System.out.print(c);
                    }
                }
                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