There are 3 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 (1, 5)
Distance from target shape to blue rectangle at (8, 7): 9
Distance from target shape to pink rectangle at (3, 1): 6
Closest shape is the pink rectangle at (3, 1) with distance 6</think>

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