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: Marshes are shallow wetlands less than ____ meters deep.
Example Output: two

Example Input: Photons have no mass and ____ electrical charge.
Example Output: no

Example Input: Altimetric satellites are usually limited life missions lasting approximately ____ to ten years.
Example Output:
three