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

Input: Consider Input: Muskrats are semi-aquatic and prefer locations with four to _ feet of water.

Output: six


Input: Consider Input: Whales have only _ enemies-man and the killer whale.

Output: two


Input: Consider Input: Women begin to have heart attacks about _ years later than men.


Output: ten