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

Input: Consider Input: Fire extinguishers have _ parts.

Output: seven


Input: Consider Input: Lactation probably occurs for the first _ months after parturation.

Output: two


Input: Consider Input: Barbershop harmony is a style of unaccompanied singing with _ voices harmonizing to the melody.


Output: three