There are 6 shapes on a 10x10 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 (6, 1)
Distance from target shape to gray trapezoid at (3, 5): 7
Distance from target shape to green trapezoid at (8, 1): 2
Distance from target shape to purple rectangle at (5, 1): 1
Distance from target shape to brown right_triangle at (6, 4): 3
Distance from target shape to red right_triangle at (7, 5): 5
Closest shape is the purple rectangle at (5, 1) with distance 1</think>

<answer>(5, 1)</answer>