There are 4 shapes on a 4x4 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 (1, 2)
Distance from target shape to green square at (3, 3): 3
Distance from target shape to blue rectangle at (2, 3): 2
Distance from target shape to pink square at (3, 1): 3
Closest shape is the blue rectangle at (2, 3) with distance 2</think>

<answer>(2, 3)</answer>