There are 4 shapes on a 9x9 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 (0, 4)
Distance from target shape to red square at (3, 1): 6
Distance from target shape to purple square at (2, 8): 6
Distance from target shape to gray square at (8, 0): 12
Closest shape is the red square at (3, 1) with distance 6</think>

<answer>(3, 1)</answer>