Each of the questions below consists of a question and three statements numbered I, II and III  given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read the question and all three statements and give answer accordingly. Who among P, Q, R, S, T and U is the tallest?
I. Only two of them are taller than R.
II. S is shorter than U.
III. R is taller than P but shorter than U and Q.