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: Some tropical species have ____ or three generations per year.
Example Output: two

Example Input: Dogs are pack animals, and ____ dogs is the minimum number for proper socialization.
Example Output: five

Example Input: Geometry consists of ____ parts, plane and solid.
Example Output:
two