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.

Ex Input:
kleenex : box. cereal : ?

Ex Output:
box


Ex Input:
socks : drawer. potatoes : ?

Ex Output:
sack


Ex Input:
diapers : bag. diapers : ?

Ex Output:

box