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: Sealants can normally last up to ____ years and hold up very well under normal chewing.
Example Output: five

Example Input: Sin divides minds into ____ halves.
Example Output: two

Example Input: Whales are divided into ____ categories, based on their teeth.
Example Output:
two