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.

Input: Consider Input: walnut : shell. shoe : ?

Output: untie


Input: Consider Input: shoe : untie. suitcase : ?

Output: open


Input: Consider Input: backpack : unzip. present : ?


Output: open