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: Hamsters can live to be ____ to four years old.
Example Output: three

Example Input: Green energy comes in ____ basic forms.
Example Output: two

Example Input: Babies usually start sleeping through the night sometime between ____ weeks and six months of age.
Example Output:
eight