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:
Most crops require at least _ to eight hours of full sun a day to thrive.

Ex Output:
six


Ex Input:
Bone marrow replenishes itself fully within _ weeks.

Ex Output:

two