Two analogies on manipulating items in a kitchen is given in the form "A : B. C : ?". The phrase "A : B" relates item A to its appropriate manipulation B. Your task is to replace the question mark (?) with the appropriate manipulation of item C, following the "A : B" relation. Your answer should be a verb which shows a way to manipulate the given object.

Ex Input:
walnut : shell. shoe : ?

Ex Output:
untie


Ex Input:
bottle : pour. suitcase : ?

Ex Output:
open


Ex Input:
bag : unzip. bottle : ?

Ex Output:

pour