There are 4 shapes on a 9x9 grid. Which shape is closest to the purple 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: purple square at (8, 0)
Distance from target shape to brown square at (7, 4): 5
Distance from target shape to yellow rectangle at (3, 1): 6
Distance from target shape to pink rectangle at (6, 4): 6
Closest shape is the brown square at (7, 4) with distance 5</think>

<answer>(7, 4)</answer>