There are 6 shapes on a 6x6 grid. Which shape is closest to the brown square 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 square at (5, 1)
Distance from target shape to pink trapezoid at (4, 3): 3
Distance from target shape to orange trapezoid at (1, 4): 7
Distance from target shape to red rectangle at (0, 3): 7
Distance from target shape to purple rectangle at (4, 4): 4
Distance from target shape to green trapezoid at (1, 1): 4
Closest shape is the pink trapezoid at (4, 3) with distance 3</think>

<answer>(4, 3)</answer>