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: Bullying is most severe in grades ____ to nine.

Output: seven


Input: Consider Input: Human malaria is caused by ____ species of Plasmodium . .

Output: four


Input: Consider Input: Scientific understanding based on the experimental method has a history of only ____ hundred years.


Output: three