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: restaurant : taxi. island : ?

Output: boat


Input: Consider Input: canada : car. hospital : ?

Output: ambulance


Input: Consider Input: airport : train. museum : ?


Output: bus