Read the following information carefully to answer this question:
A. Six flats on a floor in two rows facing North and South are allotted to P, Q, R, S, T, and U.
B. Q gets a North facing flat and is not next to S.
C. S and U get diagonally opposite flats.
D. R, next to U, gets a South facing flat and T gets a North facing flat.
If the fiats of T and P are interchanged, whose flat will be next to that of U?