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: Carbon atoms are tetravalent, and therefore, can have ____ bonding pairs around each carbon atom.

Output: four


Input: Consider Input: Wind is renewable, and produces ____ emissions or by-products.

Output: no


Input: Consider Input: Anarchism views society on the basis of ____ fundamental pillars.


Output: two