There are 6 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 (4, 2)
Distance from target shape to purple rectangle at (5, 3): 2
Distance from target shape to yellow rectangle at (4, 1): 1
Distance from target shape to red square at (3, 4): 3
Distance from target shape to blue rectangle at (5, 1): 2
Distance from target shape to cyan rectangle at (1, 3): 4
Closest shape is the yellow rectangle at (4, 1) with distance 1</think>

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