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:
Bulbs bloom ____ to six weeks after planting.

Ex Output:
four


Ex Input:
All birds have ____ legs with four toes each.

Ex Output:
two


Ex Input:
Astronomers believe that ____ binary star systems they have observed probably contain black holes.

Ex Output:

seven