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: Nitric oxide serves ____ main functions in the body.
Example Output: three

Example Input: Wolves have ____ different types of fur.
Example Output: two

Example Input: Primary follicles have ____ stages.
Example Output:
two