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. mainland : ?

Output: boat


Input: Consider Input: theater : car. museum : ?

Output: bus


Input: Consider Input: washington : train. france : ?


Output: airplane