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: work : car. school : ?

Output: bus


Input: Consider Input: canada : bus. office : ?

Output: car


Input: Consider Input: airport : train. mars : ?


Output: spaceship