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

Example Input: Carbon comes in _ kinds- dust, coconut shell or granulated.
Example Output: three

Example Input: Optical isomers differ in the arrangement of _ groups around a chiral carbon.
Example Output: four

Example Input: Bobcats have very short tails, only three to _ inches long.
Example Output:
seven