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

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