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 (8, 9)
Distance from target shape to red right_triangle at (5, 5): 7
Distance from target shape to cyan right_triangle at (6, 5): 6
Distance from target shape to blue right_triangle at (7, 3): 7
Closest shape is the cyan right_triangle at (6, 5) with distance 6</think>

<answer>(6, 5)</answer>