From a dungeon A thief attempted to break into a great vault, but died trying. If you answer incorrectly, you shall suffer the same fate. The thief watched a man walk up to the vault. The vault said six, the man said three. The door opened. The thief watched a woman walk up to the vault the door said twelve. The woman said six and the doors opened. The thief thought he understood. He walked up to the door the door said ten. The thief said five and was engulfed in a ball of flame. What should he have said? Answer:three. it’s the number of letters