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

Ex Input:
Gravity is the weakest of all _ forces but unlike the others it has an unlimited range.

Ex Output:
four


Ex Input:
Individual caribou can lose up to _ pounds of blood during a summer season.

Ex Output:
five


Ex Input:
Sponges have _ cell types.

Ex Output:

three