import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int H = sc.nextInt();
            int W = sc.nextInt();
            if (H == 0 && W == 0) {
                break;
            }
            for (int k = 0; k < W; k++) {
                System.out.printf("#");
            }
            System.out.printf("\n");
            for (int i = 0; i < H - 2; i++) {
                System.out.printf("#");
                for (int j = 0; j < W - 2; j++) {
                    System.out.printf(".");
                }
                System.out.printf("#\n");
            }
            for (int k = 0; k < W; k++) {
                System.out.printf("#");
            }
            System.out.printf("\n\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