There are 5 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, 6)
Distance from target shape to cyan trapezoid at (9, 6): 4
Distance from target shape to brown square at (7, 8): 4
Distance from target shape to green right_triangle at (3, 0): 8
Distance from target shape to yellow rectangle at (2, 4): 5
Closest shape is the cyan trapezoid at (9, 6) with distance 4</think>

<answer>(9, 6)</answer>