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

Input: Consider Input: Flexible shapes are also shapes which have _ obvious way of being attacked.

Output: no


Input: Consider Input: Fluoroscopy has _ magnification modes and image capture.

Output: two


Input: Consider Input: Manatees are an endangered species of ancient water mammals with _ enemies except for humans.


Output: no