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: Mature plants can be up to ____ feet tall.
Example Output: six

Example Input: Most species have four toes, ____ of which are forward-pointing.
Example Output: three

Example Input: Female cats can whelp three or ____ times per year if made pregnant.
Example Output:
four