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: Most insects have two antennae, six legs, and ____ wings.
Example Output: four

Example Input: Many churches have ____ windows on each side of the nave, numbers some consider holy.
Example Output: seven

Example Input: Most people lapse into illness within ____ days after exposure.
Example Output:
seven