Erixon enters the market, turns to her right, walks 7m and reaches to market P. Then, she turns to her left, walks 3 m and reaches to market Q. Again, she turns to her left, which is towards west, walks 7 m and reaches to market R. Again, she turns to her right and reaches to market S, which 8 m away from her and moves to her right, walks 7 m and stops at the market T. How far is market R from the starting point?