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: iron : iron. dig : ?

Output: shovel


Input: Consider Input: cook : stove. mop : ?

Output: mop


Input: Consider Input: wash : rag. dig : ?


Output: shovel