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 is reached within ____ to four years.

Ex Output:
two


Ex Input:
Calves are spotted when born and develop their brown coats in ____ months.

Ex Output:
six


Ex Input:
Economists describe economic activity as having ____ levels of knowledge intensity.

Ex Output:

three