In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Input: Consider Input: Phosphates are made of _ phosphorus atom surrounded by four oxygen atoms.

Output: one


Input: Consider Input: Violets usually have _ sepals at the base and have five petals.

Output: five


Input: Consider Input: Some physicians make the mistake of prescribing a medication for only _ or four weeks.


Output: three