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: Aardvarks have ____ toes on the front feet and five toes on their back feet.
Example Output: four

Example Input: Spermatogenesis creates ____ sperm of equal size.
Example Output: four

Example Input: Plants mature within two to ____ months from seeds.
Example Output:
three