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

Ex Input:
Beavers have an average of _ young once a year.

Ex Output:
four


Ex Input:
Tarantulas have _ pairs of book lungs.

Ex Output:
two


Ex Input:
Toxicity can occur in _ different modalities, acute, sub-acute and chronic toxicity.

Ex Output:

three