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.

Input: Consider Input: Lung disease is America's number ____ killer, responsible for one in seven deaths.

Output: three


Input: Consider Input: Most insects have one or ____ pairs of wings.

Output: two


Input: Consider Input: Most aphthous ulcers heal in one to ____ weeks.


Output: two