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: Power is derived from ____ sources, money and people.
Example Output: two

Example Input: Marsupials have ____ vaginas and a double uterus.
Example Output: two

Example Input: Most organizations have at least ____ levels of security management.
Example Output:
two