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: downtown : subway. hotel : ?
Example Output: taxi

Example Input: portland : car. school : ?
Example Output: bus

Example Input: airport : car. park : ?
Example Output:
bicycle