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: All matter exists in ____ dimensional space, both internal and external.
Example Output: three

Example Input: Arthropods are made up of ____ groups of living animals and one group of extinct animals.
Example Output: four

Example Input: Orchestra conductors live ____ to seven years longer than is usual in their societies.
Example Output:
three