There are 5 shapes on a 6x6 grid. Which shape is closest to the brown 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: brown right_triangle at (0, 3)
Distance from target shape to cyan rectangle at (5, 2): 6
Distance from target shape to blue rectangle at (2, 1): 4
Distance from target shape to purple right_triangle at (0, 0): 3
Distance from target shape to orange trapezoid at (4, 2): 5
Closest shape is the purple right_triangle at (0, 0) with distance 3</think>

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