There are 6 shapes on a 9x9 grid. Which shape is closest to the brown trapezoid 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 trapezoid at (6, 7)
Distance from target shape to pink right_triangle at (7, 4): 4
Distance from target shape to red right_triangle at (3, 3): 7
Distance from target shape to yellow rectangle at (0, 7): 6
Distance from target shape to purple right_triangle at (4, 6): 3
Distance from target shape to gray right_triangle at (6, 6): 1
Closest shape is the gray right_triangle at (6, 6) with distance 1</think>

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