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 (4, 3)
Distance from target shape to purple right_triangle at (4, 4): 1
Distance from target shape to red square at (0, 4): 5
Distance from target shape to pink right_triangle at (1, 3): 3
Closest shape is the purple right_triangle at (4, 4) with distance 1</think>

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