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: Variable stars fall into ____ major physical classifications.

Output: four

Input: Consider Input: Ground squirrels have a single litter a year that averages from ____ to nine young.

Output: four

Input: Consider Input: Moles create tunnels for ____ purposes, traveling and feeding.
Output: two