import csv


def get_locations(path: str) -> list:
    """
    Method to retrieve unique locations from 'product_a' csv file.

    :param path: Path to 'product_a' csv file
    :return list: Unique locations as a list
    """
    unique_locations = set()

    with open(path) as file:
        csv_reader = csv.reader(file, delimiter=',')
        for row in csv_reader:
            unique_locations.add(row[13])

    return list(unique_locations)