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: Today there are ____ mating pairs.
Example Output: four

Example Input: Any number multiplied by ____ equals zero.
Example Output:
zero