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: Ozone is formed of ____ atoms of oxygen.

Output: three


Input: Consider Input: Airplanes still fly four to ____ times faster than zeppelins.

Output: five


Input: Consider Input: Marriage is the blending of ____ family cultures.


Output: two