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.

Input: Consider Input: park : bicycle. office : ?

Output: car


Input: Consider Input: downtown : subway. hospital : ?

Output: ambulance


Input: Consider Input: washington : airplane. downtown : ?


Output: subway