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

Example Input: White sturgeon inhabit _ large river systems, all on the western coast of North America.
Example Output: three

Example Input: Eagles attain their adult plumage at _ or five year of age.
Example Output: four

Example Input: Mortality is highest for eagles in their first year of life, especially their first _ months.
Example Output:
six