Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given 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