There are 3 shapes on a 7x7 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, 2)
Distance from target shape to red rectangle at (2, 3): 2
Distance from target shape to purple right_triangle at (5, 5): 5
Closest shape is the red rectangle at (2, 3) with distance 2</think>

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