if __name__ == '__main__':
    GOOD_OFFER = "GOOD"
    MEDIUM_OFFER = "MEDIUM"
    BAD_OFFER = "BAD"

    offers = {
        GOOD_OFFER: [10, 5],
        MEDIUM_OFFER: [5, 10],
        BAD_OFFER: [3, 3]
    }

    print(set(offers.keys()))