There are 4 shapes on a 9x9 grid. Which shape is closest to the brown 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: brown square at (5, 6)
Distance from target shape to red right_triangle at (8, 3): 6
Distance from target shape to pink trapezoid at (7, 1): 7
Distance from target shape to cyan trapezoid at (3, 1): 7
Closest shape is the red right_triangle at (8, 3) with distance 6</think>

<answer>(8, 3)</answer>