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

Ex Input:
Psychiatrists say one out of _ people are mentally ill.

Ex Output:
four


Ex Input:
New species are believed to arrive in the Mediterranean at the rate of _ to five annually.

Ex Output:
four


Ex Input:
Some ewes then have a short oestrous cycle and ovulate _ days later.

Ex Output:

six