There are 5 shapes on a 9x9 grid. Which shape is closest to the gray 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: gray right_triangle at (1, 4)
Distance from target shape to yellow square at (6, 2): 7
Distance from target shape to purple rectangle at (2, 4): 1
Distance from target shape to red right_triangle at (1, 6): 2
Distance from target shape to orange right_triangle at (7, 8): 10
Closest shape is the purple rectangle at (2, 4) with distance 1</think>

<answer>(2, 4)</answer>