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: Females usually reach sexual maturity at about four years of age, males at about ____ years.
Example Output: six

Example Input: Sponges are subdivided into ____ classes.
Example Output: three

Example Input: Female gorillas give birth to ____ infant after a pregnancy of nearly nine months.
Example Output:
one