def filter_employees(row):
    """
    Check if employee represented by row
    is AT LEAST 30 years old and makes
    MORE THAN 3500.
    :param row: A List in the format:
        [{Surname}, {FirstName}, {Age}, {Salary}]
    :return: True if the row satisfies the condition.
    """
    return row[-2] >= 30 and row[-1] > 3500