There are 3 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 (6, 3)
Distance from target shape to cyan square at (1, 5): 7
Distance from target shape to purple square at (7, 5): 3
Closest shape is the purple square at (7, 5) with distance 3</think>

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