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

<answer>(0, 3)</answer>