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: Acupuncture needles are about two to ____ inches long.
Example Output: three

Example Input: Sexual maturity is between ____ and six years of age.
Example Output: three

Example Input: Body heat is lost by the following ____ mechanisms.
Example Output:
four