Classify the emotions found in the tweet "#IfOnlyPeopleWould not exist. #humanity #life #ignorance #nature #mothernature #sad #disappointment #smh #personal #opinion #views #animals". Select from the following: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If the tweet is emotionless, reply "neutral or no emotion".