In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Input: Consider Input: Stroke is our nation's number _ killer, and a leading cause of disability for older adults.

Output: three


Input: Consider Input: Geckos have _ eyelids .

Output: no


Input: Consider Input: Pumpkins are grown on six of the _ continents, excluding Antarctica.


Output: seven