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

Example Input: Hoof balance is _ dimensional geometry.
Example Output: four

Example Input: Most insects have _ wings, but dipterans have only two.
Example Output: four

Example Input: Mangroves have _ basic organs lika any other ordinary plant, the stem, the leaf and the root.
Example Output:
three