There are 4 shapes on a 4x4 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 (2, 2)
Distance from target shape to red right_triangle at (3, 2): 1
Distance from target shape to pink trapezoid at (1, 3): 2
Distance from target shape to purple right_triangle at (3, 1): 2
Closest shape is the red right_triangle at (3, 2) with distance 1</think>

<answer>(3, 2)</answer>