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: Sexual maturity occurs at ____ to four years for females and four to five years for males.
Example Output: three

Example Input: Ostriches usually live in groups, most commonly ____ male with three females.
Example Output:
one