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: Erosion is divided into ____ main categories, water and wind.

Output: two

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

Output: four

Input: Consider Input: Microsporophylls bear ____ to eight microsporangia.
Output: two