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: Hoatzin has typical foot with ____ toes forwards and one backwards.
Example Output: three

Example Input: Pertussis is highly contagious with symptoms that can linger six to ____ weeks.
Example Output: ten

Example Input: Skin cancers are likely to recur within ____ years after treatment.
Example Output:
three