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: Gorillas are sexually mature at ____ to nine years of age.
Example Output: six

Example Input: Many countries have ____ laws against kiddie porn on the Internet.
Example Output: no

Example Input: Humans have ____ very notable physical traits.
Example Output:
four