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: mars : spaceship. mainland : ?

Output: boat


Input: Consider Input: canada : bus. bermuda : ?

Output: airplane


Input: Consider Input: hospital : ambulance. restaurant : ?


Output: taxi