There are 4 shapes on a 9x9 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 (7, 7)
Distance from target shape to red rectangle at (1, 3): 10
Distance from target shape to gray trapezoid at (6, 7): 1
Distance from target shape to yellow right_triangle at (6, 1): 7
Closest shape is the gray trapezoid at (6, 7) with distance 1</think>

<answer>(6, 7)</answer>