There are 4 shapes on a 6x6 grid. Which shape is closest to the yellow right_triangle 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 right_triangle at (3, 0)
Distance from target shape to green rectangle at (3, 5): 5
Distance from target shape to purple right_triangle at (2, 4): 5
Distance from target shape to brown trapezoid at (2, 3): 4
Closest shape is the brown trapezoid at (2, 3) with distance 4</think>

<answer>(2, 3)</answer>