There are 6 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 (5, 0)
Distance from target shape to gray rectangle at (1, 4): 8
Distance from target shape to brown right_triangle at (0, 3): 8
Distance from target shape to orange right_triangle at (0, 2): 7
Distance from target shape to green square at (4, 1): 2
Distance from target shape to red right_triangle at (2, 1): 4
Closest shape is the green square at (4, 1) with distance 2</think>

<answer>(4, 1)</answer>