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: Cockroaches have six legs, ____ antennae and some have wings.
Example Output: two

Example Input: Some species live for as little as ____ months.
Example Output: six

Example Input: Mother bears rear cubs for two to ____ years.
Example Output:
three