import java.util.Scanner;

class Main {
    public static void main(String args[]) {
        Scanner scan = new Scanner(System.in);
        StringBuilder sb = new StringBuilder();

        while(true) {
            int H = scan.nextInt();
            int W = scan.nextInt();
            if (H == 0 || W == 0) {
                break;
            }
            for (int i = 0;i < H; i++) {
                for (int j = 0;j < W; j++) {
                    if (i == 0 || i == (H - 1) || j == 0||j == (W - 1)) {
                        sb.append("#");
                    } else {
                        sb.append(".");
                    }
                }
                sb.append("\n");
            }
            sb.append("\n");
        }
        System.out.print(sb);
    }

}
/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