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: Primates have ____ digits on their forelimbs.
Example Output: five

Example Input: Scorpions have ____ legs.
Example Output: eight

Example Input: Some researchers indicate that one out of ____ young people have had sex by the age of thirteen.
Example Output:
five