Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Enter this code for 10 free Lyfts PARX #Isn't it great to save money when you shop? #blissful #FREECAB
This tweet contains emotions: 
joy, optimism