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.

Example Input: Lunar eclipses occur every ____ months, on average.
Example Output: six

Example Input: Acoustic instruments consist of ____ main parts neck, top, back and sides.
Example Output: four

Example Input: Smokers die an average of six to ____ years earlier than nonsmokers.
Example Output:
eight