There are 6 shapes on a 8x8 grid. Which shape is closest to the blue 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: blue trapezoid at (4, 3)
Distance from target shape to orange trapezoid at (2, 7): 6
Distance from target shape to purple square at (4, 5): 2
Distance from target shape to pink right_triangle at (3, 2): 2
Distance from target shape to red rectangle at (4, 2): 1
Distance from target shape to gray square at (4, 1): 2
Closest shape is the red rectangle at (4, 2) with distance 1</think>

<answer>(4, 2)</answer>