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

Ex Input:
Most women have _ problems getting pregnant with a retroverted uterus.

Ex Output:
no


Ex Input:
House wrens are small birds, four and a half to _ and a four inches in length.

Ex Output:
five


Ex Input:
Spinner dolphins are six to _ feet long and have a three part color pattern on their bodies.

Ex Output:

seven