There are 6 shapes on a 10x10 grid. Which shape is closest to the purple rectangle 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 rectangle at (8, 7)
Distance from target shape to yellow trapezoid at (0, 5): 10
Distance from target shape to blue right_triangle at (1, 5): 9
Distance from target shape to orange rectangle at (1, 1): 13
Distance from target shape to red square at (5, 5): 5
Distance from target shape to pink right_triangle at (8, 0): 7
Closest shape is the red square at (5, 5) with distance 5</think>

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