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:
Postpartum blues are common during the _ months after childbirth.

Ex Output:
three

Ex Input:
Bond angles The bond angle defined by _ atoms is calculated.

Ex Output:
three