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:
Elephants give birth to ____ calf every four to nine years on average.

Ex Output:
one


Ex Input:
Scientists divide the mosses into ____ groups .

Ex Output:
eight


Ex Input:
Calories come from ____ sources in the diet.

Ex Output:

four