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: Niobium occurs primarily in ____ minerals, columbite and pyrochlore.
Example Output: two

Example Input: ATMs are expensive machines with an average useful life of ____ to fifteen years.
Example Output: ten

Example Input: Salt marshes have ____ primary production units, all maintaining high productivity.
Example Output:
three