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: Couples spend ____ billion dollars a year on infertility treatments.

Output: two


Input: Consider Input: Finches breed when the female is over one year old and the male is under ____ year old.

Output: five


Input: Consider Input: Turtles contain ____ eyelids.


Output: three