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: Communion is that which is shared between the _ persons of the Holy Trinity.

Output: three


Input: Consider Input: Echinoderms have radial symmetry , many having _ or multiples of five arms.


Output: five