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: Most children start primary school at ____ years of age.

Output: five


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

Output: three


Input: Consider Input: Some sea stars, like the purple sea star of the Gulf of Maine, have nine or ____ arms.


Output: ten