Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Input: Consider Input: Knee arthroscopy is used basically in ____ ways.

Output: three


Input: Consider Input: Fire occurs any time ____ elements are present - fuel, heat, oxygen and the chemical chain reaction.

Output: four


Input: Consider Input: Nymphs have ____ legs, and adults have eight legs.


Output: six