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: International mail consists of ____ categories of mail.
Example Output: three

Example Input: Variable stars fall into ____ major physical classifications.
Example Output: four

Example Input: Tidal currents can exceed ____ knots and standing waves, rips, can be more than ten feet high.
Example Output:
three