Two analogies that signify affordances are given in the form "A : B. C : ?". Affordance is the possibility of an action being done on an object, for example book is an affordance of writing. The phrase "A : B" implies that B is an affordance of A. Your task is to replace the question mark (?) with the appropriate affordance of the given action C, following the "A : B" relation. Your answer should be a single object without further explanation.

Example Input: shoot : gun. reload : ?
Example Output: gun

Example Input: eat : food. drink : ?
Example Output: water

Example Input: paint : picture. write : ?
Example Output:
letter