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

Input: Consider Input: Climatic regions Contrasts between the interior and the coasts produce _ main climatic regions.

Output: six

Input: Consider Input: Sharks have five to _ gill slits.

Output: seven

Input: Consider Input: Ornithologists recognize _ subspecies of the Gray Singing Finch.
Output: three