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:
Fish kills can occur when oxygen is less than ____ ppm.

Ex Output:
three


Ex Input:
Most children recover completely in ____ to three months.

Ex Output:
two


Ex Input:
Earthworms have ____ hearts.

Ex Output:

five