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.

Example Input: Cytochrome oxidase consists of two cytochromes and ____ copper atoms.
Example Output: two

Example Input: Pigs grow very quickly and are normally ready for sale at ____ to six months of age.
Example Output: four

Example Input: Crux lies on the Milky Way and is surrounded by the constellation Centaurus on ____ sides.
Example Output:
three