There are 6 shapes on a 8x8 grid. Which shape is closest to the brown 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: brown rectangle at (3, 3)
Distance from target shape to pink right_triangle at (5, 3): 2
Distance from target shape to orange trapezoid at (1, 1): 4
Distance from target shape to green right_triangle at (1, 6): 5
Distance from target shape to purple right_triangle at (1, 0): 5
Distance from target shape to yellow trapezoid at (0, 2): 4
Closest shape is the pink right_triangle at (5, 3) with distance 2</think>

<answer>(5, 3)</answer>