There are 3 shapes on a 8x8 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 (6, 4)
Distance from target shape to green square at (0, 2): 8
Distance from target shape to orange square at (5, 3): 2
Closest shape is the orange square at (5, 3) with distance 2</think>

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