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: John makes it into the finals of the Citi Open after his 6-7(7), 6-3, 6-4 win over Dmitry Tursunov. He will meet number one seed Juan Martin Del Potro in the finals today (not before 3:00pm on Stadium Court)  Responser: crkni mater ti jeben pickastu sto ti je jos tribalo danas dati da iskoristis
