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

Output: seven


Input: Consider Input: Theobroma oil can exist in four different polymorphic forms of which only ____ is stable.

Output: one


Input: Consider Input: Extant hominoids are here divided into ____ families.


Output: three