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: Industrial halocarbons are effective ozone-depleters for ____ reasons.

Output: two


Input: Consider Input: Nymphs go through ____ instars and a pupa stage before reaching adulthood.

Output: three


Input: Consider Input: Numbers can be positive or ____ only.


Output: zero