P, Q, R, S, T and U are sitting in a straight line, all facing the north. Only 3 persons are sitting between Q and P. U is second to the left of T. R is second to the right of T. P is second to the right of S. Q is second to the left of S. S is sitting between U and T.
Who is sitting third to the left of R?
1
S
2
Q
3
U
4
T