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

Example Input: Phosphates are made of _ phosphorus atom surrounded by four oxygen atoms.
Example Output: one

Example Input: Disruptive selection can lead to _ new species.
Example Output: two

Example Input: Beer is made from fermented grains and has an alcohol content of _ to six percent.
Example Output:
three