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: Mature plants can be up to ____ feet tall.
Example Output: six

Example Input: Fruit is a silique opening by ____ valves.
Example Output: two

Example Input: Musical usage predates the psychiatric by nearly ____ centuries.
Example Output:
three