Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Ex Input:
Some people routinely sleep only ____ hours a night but feel fine during the day.

Ex Output:
four


Ex Input:
Some women experience a labor of three to ____ days.

Ex Output:
five


Ex Input:
Mammals have ____ cervical vertebrae, a number that remains remarkably constant.

Ex Output:

seven