There are 4 shapes on a 9x9 grid. Which shape is closest to the red 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: red rectangle at (6, 1)
Distance from target shape to brown rectangle at (7, 5): 5
Distance from target shape to orange right_triangle at (8, 7): 8
Distance from target shape to blue right_triangle at (0, 0): 7
Closest shape is the brown rectangle at (7, 5) with distance 5</think>

<answer>(7, 5)</answer>