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

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