There are 3 shapes on a 8x8 grid. Which shape is closest to the red rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: red rectangle at (4, 2)
Distance from target shape to green square at (3, 6): 5
Distance from target shape to pink trapezoid at (7, 5): 6
Closest shape is the green square at (3, 6) with distance 5</think>

<answer>(3, 6)</answer>