There are 5 shapes on a 5x5 grid. Which shape is closest to the red rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: red rectangle at (4, 3)
Distance from target shape to gray right_triangle at (0, 4): 5
Distance from target shape to pink square at (4, 4): 1
Distance from target shape to cyan rectangle at (1, 2): 4
Distance from target shape to green rectangle at (0, 1): 6
Closest shape is the pink square at (4, 4) with distance 1</think>

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