In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Ex Input:
Females inherit _ X chromosomes, one from each parent.

Ex Output:
two


Ex Input:
Carbon dioxide accounts for _ fourths of the predicted increase in the greenhouse effect.

Ex Output:
three


Ex Input:
Most people are able to have sex from three to _ weeks after a heart attack.

Ex Output:

six