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: Statistics show that one out of every ____ people has a mental illness.
Example Output: four

Example Input: Mature females bear two or even ____ calves a year.
Example Output: three

Example Input: Earth produces enough food to feed ____ worlds equal to the Earth.
Example Output:
three