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

Ex Input:
Geckos have _ eyelids .

Ex Output:
no


Ex Input:
Dairy cows live for _ generations, calve and produce normal milk on a protein-free diet.

Ex Output:
six


Ex Input:
Gerbils usually live for _ to four years.

Ex Output:

three