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: Seismologists offer ____ major theories for the occurrence of large, deep earthquakes.
Example Output: three

Example Input: Divorce affects one out of every ____ marriages today.
Example Output: four

Example Input: Ecologists recognize ____ kinds of succession.
Example Output:
two