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

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

Output: eight


Input: Consider Input: Birds begin dying of fowl cholera _ to nine days after exposed to the virus.

Output: four


Input: Consider Input: Traditional neon electrifies the inert gas from _ directions.


Output: two