You are given the current stock prices. You have to find out which stocks cost more. Input: The dictionary where the market identifier code is a key and the value is a stock price. Output: The market identifier code (ticker symbol) as a string. Example: best_stock({"CAC": 10.0, "ATX": 390.2, "WIG": 1.2}) == "ATX" best_stock({"CAC": 91.1, "ATX": 1.01, "TASI": 120.9}) == "TASI" * 딕셔너리 형태로 값 비교해서 제..