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: Acoustic instruments consist of ____ main parts neck, top, back and sides.

Output: four


Input: Consider Input: Carbon is able to bond with up to ____ other elements.

Output: four


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


Output: two