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

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

Output: three

Input: Consider Input: Most litters have two to _ kittens.

Output: four

Input: Consider Input: Cichlids are popular in the aquarium hobby for a _ reason.
Output: four