You wake up in a cell after a party. You just remember the beginning of the night: you talked to your friends, you drank some alcohol, and then you blacked out.
You stand up and look around you: you are in a small empty room with no window and a door locked with a numeric keypad.
You approach the keypad and notice a piece of paper:
You'd better not try to steal my spaghetti recipe again!
I'll let you out if you can solve this puzzle:
are all acceptable numbers, but
If you find the key, you can live. (And if you fail, my pet elephant will make sure you wish you weren't alive...).
What is the key to the puzzle?
The key is 2-char long
(Note: This isn't a lateral-thinking question, so there's no need for ridiculous answers like "I punch through the wall".)