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

Ex Input:
Pelagic division is divided into neritic and _ levels of pelagic provinces.

Ex Output:
three


Ex Input:
R is an average of the color rendering ability of _ or more specific colors.

Ex Output:
eight


Ex Input:
Females can have calves when they are about _ years old.

Ex Output:

four