Display the string passed to plsql program using astericks

Hi,
I have a strange requirement where in , if i enter name like Mad and pass it to plsql program , then  i need to get the result as

* * * *         * * * *
* * * *         * * * *
* *  * *       * *  * *
* *   * *     * *   * *
* *    * *   * *    * *
* *     * * * *     * *
* *                    * *
* *                    * *
* *                    * *
* *                    * *
* *                    * *  for A and D also it should display in the astericks.

Is that possible other than hard coding for 26 letters.

Uday