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.

Example Input: Fitness has ____ components, aerobic and muscular.
Example Output: two

Example Input: Most dens are oval shape, six to nine feet long and about ____ feet in height and width.
Example Output: six

Example Input: Most estimates place the Earth's long-term capacity at ____ to sixteen billion.
Example Output:
four