Find Expensive Cities

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Example Testcases:

{"headers":{"Listings":["listing_id","city","price"]},"rows":{"Listings":[[113,"LosAngeles",7560386],[136,"SanFrancisco",2380268],[92,"Chicago",9833209],[60,"Chicago",5147582],[8,"Chicago",5274441],[79,"SanFrancisco",8372065],[37,"Chicago",7939595],[53,"LosAngeles",4965123],[178,"SanFrancisco",999207],[51,"NewYork",5951718],[121,"NewYork",2893760]]}}