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.


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

Preconditions: All the prices are unique.