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

Input: Consider Input: All insects have _ body sections, the head , thorax , and abdomen.

Output: three


Input: Consider Input: Saturated bonds are when each of the carbons has _ single bonds as in the top figure.

Output: four


Input: Consider Input: Chlorination is necessary for _ reasons.


Output: two