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

Ex Input:
Lemurs are very social and travel in troops of _ to thirty.

Ex Output:
three


Ex Input:
Saturated bonds are when each of the carbons has _ single bonds as in the top figure.

Ex Output:
four


Ex Input:
Tumor viruses are of _ distinct types.

Ex Output:

two