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

Example Input: Most cats have only _ to five toes per paw, depending on whether it is the front or back paw.
Example Output: four

Example Input: Granite weathers one inch in _ thousand years.
Example Output: ten

Example Input: Some particles are colour neutral but have only _ quarks.
Example Output:
two