There are 5 shapes on a 6x6 grid. Which shape is closest to the pink square 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 square at (3, 5)
Distance from target shape to blue trapezoid at (3, 0): 5
Distance from target shape to cyan trapezoid at (0, 4): 4
Distance from target shape to purple rectangle at (4, 5): 1
Distance from target shape to yellow right_triangle at (4, 3): 3
Closest shape is the purple rectangle at (4, 5) with distance 1</think>

<answer>(4, 5)</answer>