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

<answer>(4, 5)</answer>