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 (4, 3)
Distance from target shape to purple trapezoid at (0, 7): 8
Distance from target shape to cyan right_triangle at (1, 2): 4
Closest shape is the cyan right_triangle at (1, 2) with distance 4</think>

<answer>(1, 2)</answer>