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: Mammals have ____ cervical vertebrae, a number that remains remarkably constant.
Example Output: seven

Example Input: Child care is provided for children ages six weeks through ____ years of age.
Example Output: four

Example Input: Natural selection affects the distripution of phenotypes in ____ ways.
Example Output:
three