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: restaurant : taxi. hospital : ?
Example Output: ambulance

Example Input: canada : car. theater : ?
Example Output: car

Example Input: museum : bus. downtown : ?
Example Output:
subway