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

Input: Consider Input: Arthritis is the leading cause of disability in the state affecting about one in _ adults.

Output: three

Input: Consider Input: Prostate cancer has _ symptoms in the early stages.

Output: no

Input: Consider Input: Pyrimidines contain _ ring and purines contain two rings.
Output: one