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:
Cytochrome oxidase consists of two cytochromes and ____ copper atoms.

Ex Output:
two

Ex Input:
Hypertension afflicts about ____ in four American adults, both men and women, of all ages.

Ex Output:
one

Ex Input:
Triglycerides appear in ____ forms, saturated and unsaturated.

Ex Output:
two