Two analogies that relate items to the associated containers is given in the form "A : B. C : ?". "A : B" relates item A to its associated container B. Your task is to replace the question mark (?) with the appropriate container for the given item C, following the "A : B" relation.

Input: Consider Input: picture : frame. milk : ?

Output: jug


Input: Consider Input: potatoes : sack. picture : ?

Output: frame


Input: Consider Input: milk : jug. potatoes : ?


Output: sack