How do you beat level 11 on 100 exits

You have to morse code SOS on the door. Do 3 fast taps on the door, then 3 times slower, then 3 fast taps. See related link for screenshots.
You have to tap SOS in morse code on the door. 3 quick taps, 3 slower and little bit more dragged out taps, and 3 quick taps. See related link for screenshots.