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: Amphibians have ____ legs, and often look like reptiles.

Output: four


Input: Consider Input: People often have to wait between three and ____ years for an organ especially for a liver.

Output: five


Input: Consider Input: Photons have ____ rest mass.


Output: zero