human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Call sign, Frequency MHz, City of license, ERP W, Class, FCC info
###Question: What is City of License, when ERP W is greater than 3, and when Call Sign is K218DZ?
gpt
SELECT City of license FROM table WHERE ERP W > 3 AND Call sign = k218dz