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.

Input: Consider Input: wash : soap. spread : ?

Output: knife


Input: Consider Input: clamp : clamp. eat : ?

Output: fork


Input: Consider Input: eat : spoon. iron : ?


Output: iron