There are 6 shapes on a 6x6 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 (3, 1)
Distance from target shape to gray rectangle at (2, 5): 5
Distance from target shape to green right_triangle at (1, 5): 6
Distance from target shape to cyan trapezoid at (4, 1): 1
Distance from target shape to brown square at (0, 5): 7
Distance from target shape to purple right_triangle at (4, 3): 3
Closest shape is the cyan trapezoid at (4, 1) with distance 1</think>

<answer>(4, 1)</answer>