There are 4 shapes on a 10x10 grid. Which shape is closest to the brown 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: brown rectangle at (9, 6)
Distance from target shape to pink right_triangle at (4, 8): 7
Distance from target shape to yellow trapezoid at (8, 1): 6
Distance from target shape to purple square at (2, 7): 8
Closest shape is the yellow trapezoid at (8, 1) with distance 6</think>

<answer>(8, 1)</answer>