Two analogies that relate actions to the tools used to perform the action is given in the form "A : B. C : ?". "A : B" relates action A to tool B. Your task is to replace the question mark (?) with the appropriate tool for the given action C, following the "A : B" relation.

Example Input: iron : iron. spread : ?
Example Output: knife

Example Input: sweep : broom. toast : ?
Example Output: toaster

Example Input: eat : spoon. scrub : ?
Example Output:
brush