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: Natural ytterbium is a mixture of ____ stable isotopes, with seven other unstable isotopes known.
Example Output: seven

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

Example Input: Human feet bear average ____ to six hundreds tons of weight everyday.
Example Output:
five