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

Ex Input:
Frozen grafts can have a shelf life of up to _ years.

Ex Output:
five


Ex Input:
Presta valves are the skinnier of the _ valve types.

Ex Output:
two


Ex Input:
HOD usually shows up as an acute lameness, often seeming to affect all _ legs simultaneously.

Ex Output:

four