<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_fiat_prices(self, base=None, symbol=None):
 """Get fiat price for currency https://docs.kucoin.com/#get-fiat-price :param base: (optional) Fiat,eg.USD,EUR, default is USD. :type base: string :param symbol: (optional) Cryptocurrencies.For multiple cyrptocurrencies, please separate them with comma one by one. default is all :type symbol: string .. code:: python prices = client.get_fiat_prices() :returns: ApiResponse .. code:: python { "BTC": "3911.28000000", "ETH": "144.55492453", "LTC": "48.45888179", "KCS": "0.45546856" } :raises: KucoinResponseException, KucoinAPIException """


        data = {}

        if base is not None:
            data['base'] = base
        if symbol is not None:
            data['currencies'] = symbol

        return self._get('prices', False, data=data)