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: Moths are most active during the first three to ____ hours of darkness.
Example Output: five

Example Input: Monatomic elements have with ____ atoms in each per molecule.
Example Output: three

Example Input: Turkish vowels are in ____ classes, front and back.
Example Output:
two