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 (1, 7)
Distance from target shape to cyan square at (9, 7): 8
Distance from target shape to brown rectangle at (0, 6): 2
Distance from target shape to pink trapezoid at (5, 4): 7
Distance from target shape to yellow rectangle at (2, 5): 3
Distance from target shape to blue right_triangle at (1, 6): 1
Closest shape is the blue right_triangle at (1, 6) with distance 1</think>

<answer>(1, 6)</answer>