There are 6 shapes on a 8x8 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 (5, 3)
Distance from target shape to pink right_triangle at (5, 4): 1
Distance from target shape to gray trapezoid at (3, 7): 6
Distance from target shape to red rectangle at (0, 4): 6
Distance from target shape to green trapezoid at (4, 3): 1
Distance from target shape to blue square at (5, 6): 3
Closest shape is the pink right_triangle at (5, 4) with distance 1</think>

<answer>(5, 4)</answer>