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

Ex Input:
Pure water contains _ ions and is therefore a nonconductor .

Ex Output:
no


Ex Input:
Domestic violence occurs in one in _ families in Australia.

Ex Output:
four


Ex Input:
Shrubs are perennial plants-meaning they live for at least _ years.

Ex Output:

three