Best Stock Best Stock
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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.


best_stock({"CAC": 10.0, "ATX": 390.2, "WIG": 1.2}) == "ATX"
best_stock({"CAC": 91.1, "ATX": 1.01, "TASI": 120.9}) == "TASI"

Preconditions: All the prices are unique.