def map_symbols_to_currencies(currencies):
    """
    Create dictionary where key is symbol of currency and value is
    currency itself

    :param list currencies:
        List of dictionaries with data about many currencies
    :return: Dictionary with symbols and currencies
    :rtype: dict

    :raises KeyError: When given argument has wrong format
    """
    result_dict = {}
    for currency_dict in currencies:
        result_dict[currency_dict["symbol"]] = currency_dict["cc"]
    return result_dict