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

Ex Input:
Pollination is accomplished only by insect-agency, and where insects fail _ fruits are ripened.

Ex Output:
no

Ex Input:
Blood is made up of _ parts.

Ex Output:
four

Ex Input:
Springtails have only _ or five segments in their abdomen, fewer than any other insect.

Ex Output:
four