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

Example Input: Southern moles are six to seven inches long and weigh _ to four ounces.
Example Output: three

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

Example Input: Flies have all that plus _ wings and halteres.
Example Output:
two