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: Naiads have ____ caudal filaments and external gills.

Output: two

Input: Consider Input: Some people routinely sleep only ____ hours a night but feel fine during the day.

Output: four

Input: Consider Input: Many physicists believe that the neutrino, like a photon, has ____ mass at all.
Output: no