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:
Multiplications are always ____ complemental.

Ex Output:
two


Ex Input:
Some niqabs have ____ or two holes for the eyes.

Ex Output:
one


Ex Input:
Every plane curve has at least ____ vertices.

Ex Output:

four