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

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