There are 5 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 (7, 1)
Distance from target shape to orange right_triangle at (0, 2): 8
Distance from target shape to cyan rectangle at (5, 4): 5
Distance from target shape to purple square at (0, 6): 12
Distance from target shape to green rectangle at (4, 2): 4
Closest shape is the green rectangle at (4, 2) with distance 4</think>

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