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: Respiratory therapists complete two to ____ years of education.

Output: four


Input: Consider Input: Perennials are plants that live more than ____ growing seasons.

Output: two


Input: Consider Input: Foams are neither solid, liquid, nor gas, but they exhibit properties of all ____ states.


Output: three