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:
Females usually reach sexual maturity at about four years of age, males at about ____ years.

Ex Output:
six

Ex Input:
Prokaryotes mean they have ____ nucleus in which they store genetic material.

Ex Output:
no

Ex Input:
Chlorine is in a group of elements having ____ electrons in their outer shells.

Ex Output:
seven