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

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