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: Most children recover completely in ____ to three months.
Example Output: two

Example Input: Malaria kills up to ____ million people each year.
Example Output: two

Example Input: Prosthodontists typically train for ____ years to learn the best ways to restore dental implants.
Example Output:
three