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: Metamorphosis takes over ____ months and the froglets come out really small.
Example Output: five

Example Input: Many biologists believe the sandhill has been virtually unchanged for ____ million years.
Example Output: nine

Example Input: Allosteric regulation affects the ____ pathways in individual cells.
Example Output:
two