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: Tin has ____ allotropic forms.

Output: two


Input: Consider Input: Body temperature attains ambient levels within four to ____ hours.

Output: six


Input: Consider Input: Lightning is described as having ____ parts.


Output: two