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.

Input: Consider Input: Pigs grow very quickly and are normally ready for sale at ____ to six months of age.

Output: four


Input: Consider Input: Fish kills can occur when oxygen is less than ____ ppm.

Output: three


Input: Consider Input: Nymphs go through ____ molts before becoming adults, which takes approximately one year.


Output: seven