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

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