There are 4 shapes on a 10x10 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 (5, 5)
Distance from target shape to red trapezoid at (5, 1): 4
Distance from target shape to brown square at (4, 6): 2
Distance from target shape to orange square at (0, 7): 7
Closest shape is the brown square at (4, 6) with distance 2</think>

<answer>(4, 6)</answer>