import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int H = scan.nextInt();
        int W = scan.nextInt();
        int w = 0;
        int h = 0;
        while (H != 0 && W != 0) {
            while (h < H) {
                while (w < W) {
                    if (w == (W - 1)) {
                        System.out.println("#");
                    } else if (h == 0 || h == (H - 1)) {
                        System.out.print("#");
                    } else {
                        if (w == 0) {
                            System.out.print("#");
                        } else {
                            System.out.print(".");
                        }
                    }
                    w++;
                }
                h++;
                w = 0;
            }
            w = 0;
            h = 0;
            H = scan.nextInt();
            W = scan.nextInt();
            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