public class Main {
    public static void main (String[] srgs){

        // ??????????????????????????????.
        java.util.Scanner sc = new java.util.Scanner(System.in);

        // ?????????????????? int ?????¨??????????????\???????????????.
        // ??????????????????????????? 0 ????????????.
        while (true) {
            int H = sc.nextInt();
            int W = sc.nextInt();
            if (H == 0 && W == 0) { break; }

            // H * W ???????????¢ (????????????) ???????????????.
            for (int i = 0; i < H; i ++) {
                if (i == 0 || i == H - 1) {
                    for (int j = 0; j < W; j ++) { System.out.print("#"); }
                }
                else {
                    for (int j = 0; j < W; j ++) {
                        if (j == 0 || j == W - 1) { System.out.print("#"); }
                        else { 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