Two analogies that relate places/locations to the associated travel mode is given in the form "A : B. C : ?". "A : B" relates place A to travel mode B. Your task is to replace the question mark (?) with the appropriate travel mode for the given place C, following the "A : B" relation.

Example Input: museum : bus. washington : ?
Example Output: train

Example Input: mainland : boat. hawaii : ?
Example Output: airplane

Example Input: mall : bus. store : ?
Example Output:
car