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

Example Input: Cats There are thirty _ recognised species of cats and a whole host of subspecies or races.
Example Output: five

Example Input: Atoms are most stable when they have _ electrons in their outer electron energy level.
Example Output: eight

Example Input: Walruses can remain submerged for as long as _ minutes.
Example Output:
ten