There are 4 shapes on a 5x5 grid. Which shape is closest to the yellow 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: yellow square at (3, 1)
Distance from target shape to brown rectangle at (0, 4): 6
Distance from target shape to gray rectangle at (4, 2): 2
Distance from target shape to blue square at (3, 4): 3
Closest shape is the gray rectangle at (4, 2) with distance 2</think>

<answer>(4, 2)</answer>