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: Most insects have one or ____ pairs of wings.
Example Output: two

Example Input: Philosophy has ____ axioms since it is simply what reason knows by means of concepts.
Example Output: no

Example Input: Economists generally cite ____ sources or types of unemployment.
Example Output:
four