Definition: Given a 'poster' sentence and a corresponding 'response' (often, from Facebook or Reddit)classify the sentiment of the given response into four categories: 1) Positive, 2) Negative, 3) Neutral, and 4) Mixed if it contains both positive and negative.
Input: Poster: I welcome Bank of America's retreat on debit card fees & hope other banks take notice. $5/month fee is an unfair surcharge on working ppl.  Responser: @Kali - Andrew Jackson actually did end the Bank. google what his tombstone reads
