There are 5 shapes on a 6x6 grid. Which shape is closest to the brown trapezoid 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 trapezoid at (5, 4)
Distance from target shape to purple rectangle at (3, 1): 5
Distance from target shape to green right_triangle at (2, 3): 4
Distance from target shape to pink right_triangle at (4, 1): 4
Distance from target shape to blue rectangle at (2, 5): 4
Closest shape is the green right_triangle at (2, 3) with distance 4</think>

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