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: Western medicine uses ____ approaches, drugs or surgery.
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: Economists divide resources into ____ basic categories of land, labor, capital, and management.
Example Output:
four