There are 6 shapes on a 5x5 grid. Which shape is closest to the brown 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: brown rectangle at (2, 3)
Distance from target shape to purple square at (1, 0): 4
Distance from target shape to gray square at (1, 4): 2
Distance from target shape to pink rectangle at (4, 0): 5
Distance from target shape to red right_triangle at (3, 3): 1
Distance from target shape to yellow rectangle at (3, 2): 2
Closest shape is the red right_triangle at (3, 3) with distance 1</think>

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