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

Example Input: Every drug has _ names, a chemical name, a brand name, and an official name.
Example Output: three

Example Input: Gestation is _ to nine months long, after which a single calf is born.
Example Output: eight

Example Input: Psychologists say there are at least _ levels of goals.
Example Output:
three