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:
Sexual maturity occurs at ____ to four years for females and four to five years for males.

Ex Output:
three


Ex Input:
Milk is a good source of all ____ nutrients.

Ex Output:
three


Ex Input:
Normal cells have a telomere ladder, each containing partials up to ____ subunits.

Ex Output:

seven