Best Stock Best Stock
RU English

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: A string and the market identifier code.

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'

Preconditions: All the prices are unique.