Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Input: Consider Input: Stereo cameras track the fly's movement in ____ dimensions.

Output: three


Input: Consider Input: Ozone is formed of ____ atoms of oxygen.

Output: three


Input: Consider Input: Most healthy men experience about three to ____ erections in their sleep each night.


Output: five