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: Sexual reproduction involves the union of cells from ____ parents.
Example Output: two

Example Input: Most aphthous ulcers heal in ____ to two weeks.
Example Output:
one