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: Sponges are subdivided into ____ classes.

Output: three


Input: Consider Input: Mammals have ____ cervical vertebrae, a number that remains remarkably constant.

Output: seven


Input: Consider Input: Dietitians recommend after school snacks from the ____ basic food groups.


Output: four