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: Potential energy is divided into ____ different types of energy.

Output: three


Input: Consider Input: Prions are protein molecules which have ____ metastable states.

Output: two


Input: Consider Input: Children ages one to ____ years are the most common victims of poisoning.


Output: three