Write the text then press <down arrow> to 'print'. Press Left Arrow to wipe the letters one by one before 'printing'. Click the text and then the down arrow again to delete. If there is no text, you can click where you want the cursor to start.
Letter A, B and <Space> are ready. Make the other letters. =) You can also change the size of the letter inside the script. (Recommend between 50 and 30)