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: Many diseases require the tick to be attached for ____ or more hours to transmit disease.

Output: six


Input: Consider Input: Deforestation concerns people for ____ major reasons.


Output: two