Six shelves, R, S, T, U, V and W, are kept one above the other, such that bottommost shelf is numbered as 1 and the topmost shelf is numbered as 6. Two shelves are between T and S. S is kept below T, which is not kept at odd numbered position. R is kept just above
V. U is kept below
V. U is kept at even numbered position. W is not kept adjacent to T. Which shelf is kept at topmost position?