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

Example Input: Dwarf trees are diminutive and shrub-like, reaching _ feet or so at maturity.
Example Output: four

Example Input: Pollination is accomplished only by insect-agency, and where insects fail _ fruits are ripened.
Example Output: no

Example Input: All animals have offspring, usually with _ parents involved.
Example Output:
two