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 become sexually mature at the age of ____ years.
Example Output: five

Example Input: Acupuncture needles are about two to ____ inches long.
Example Output: three

Example Input: Females usually have one child every ____ years.
Example Output:
six