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: Many biologists believe the sandhill has been virtually unchanged for ____ million years.
Example Output: nine

Example Input: Females usually reach sexual maturity at about four years of age, males at about ____ years.
Example Output: six

Example Input: Cats have five toes on their front paws, but only ____ touch the ground when walking.
Example Output:
four