In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Example Input: Liquids usually descend in three to five seconds, and solids in _ to twenty seconds.
Example Output: eight

Example Input: Most volcanoes erupt for _ to four weeks and then rest.
Example Output: three

Example Input: Sharks kill _ swimmers in less than a year.
Example Output:
three