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: Variable stars fall into ____ major physical classifications.
Example Output: four

Example Input: Most people get one or ____ common colds every year.
Example Output: two

Example Input: Precocial birds learn to forage within ____ or four days.
Example Output:
three