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

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

Ex Output:
three


Ex Input:
Packs usually have fewer than _ wolves.

Ex Output:
ten


Ex Input:
Diatoms consist of _ shells made of glass silicone dioxide.

Ex Output:

two