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

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

Ex Output:
eight


Ex Input:
Monkeys are much more resistant and can live up to _ minutes.

Ex Output:
five


Ex Input:
Wax esters in _ species of freshwater zooplankton.

Ex Output:

two