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

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

Output: four


Input: Consider Input: Sierra County has _ different regions.

Output: two


Input: Consider Input: Cats have fur, _ legs, and a tail the same as dogs do.


Output: four