There are 4 shapes on a 5x5 grid. Which shape is closest to the red 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: red square at (2, 3)
Distance from target shape to brown rectangle at (2, 0): 3
Distance from target shape to pink right_triangle at (0, 1): 4
Distance from target shape to gray rectangle at (0, 3): 2
Closest shape is the gray rectangle at (0, 3) with distance 2</think>

<answer>(0, 3)</answer>