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:
Mollusks have one or ____ hearts.

Ex Output:
two


Ex Input:
Photons have momentum but ____ mass or electrical charge.

Ex Output:
no


Ex Input:
Psychology has ____ means to deal with inherited behavioral disorders like addictions.

Ex Output:

no