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

Ex Input:
Indoor cats live _ times as long as outdoor cats.

Ex Output:
three

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

Ex Output:
eight

Ex Input:
Any number divided by itself equals one , except if that number is _ .

Ex Output:
zero