Graphs of the Other Trigonometric Functions · Medium problem

By how much is the graph of $y = -\cot\left(\dfrac{1}{3}x - \dfrac{\pi}{2}\right)$ shifted horizontally compared with $y = -1\cot\left(\dfrac{1}{3}x\right)$? Give the signed shift as an exact multiple of $\pi$ (positive means to the right).