There are 5 shapes on a 7x7 grid. Which shape is closest to the purple rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: purple rectangle at (0, 6)
Distance from target shape to green trapezoid at (5, 2): 9
Distance from target shape to gray right_triangle at (5, 4): 7
Distance from target shape to cyan square at (2, 6): 2
Distance from target shape to brown right_triangle at (0, 2): 4
Closest shape is the cyan square at (2, 6) with distance 2</think>

<answer>(2, 6)</answer>