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: Tin exists in ____ allotropic forms.
Example Output: three

Example Input: Prokaryotes mean they have ____ nucleus in which they store genetic material.
Example Output: no

Example Input: Symbolic figures serve ____ primary functions in social action systems.
Example Output:
two