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: Hypertension afflicts about ____ in four American adults, both men and women, of all ages.
Example Output: one

Example Input: Romantic love involves ____ people.
Example Output: two

Example Input: Prairie dogs bear ____ or five young per litter.
Example Output:
four