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: Lancelets display all ____ of the vertebrate characteristics throughout their lives.
Example Output: four

Example Input: Babies can be exclusively breast-fed for their first ____ months of life.
Example Output: six

Example Input: Most people start smoking again within the first ____ months of quitting.
Example Output:
three