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: Amphibians are the first true vertebrates with ____ limbs.

Output: four


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

Output: two


Input: Consider Input: Igneous rock occurs in ____ ways .


Output: two