There are 3 shapes on a 6x6 grid. Which shape is closest to the blue 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: blue right_triangle at (4, 5)
Distance from target shape to red right_triangle at (3, 2): 4
Distance from target shape to orange trapezoid at (3, 4): 2
Closest shape is the orange trapezoid at (3, 4) with distance 2</think>

<answer>(3, 4)</answer>