Uncertain number of people are sitting in a row by facing the North direction. R is sitting at one of the ends and there are two people between R and Q. Equal number of persons are sitting between U and R and U and S. Two persons are sitting between S and V. Equal number of persons are sitting to the right and left side of V. T is sitting exactly in the middle of P and S. U is third to the left of Q who is sitting fourth from one of the extreme ends of the row. P is sitting at one of the extreme ends of the row. U is not sitting on any of the extreme ends of the row. Number of people sitting between P and S are five.  

Who is sitting between U and S?