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 (1, 4)
Distance from target shape to purple square at (3, 3): 3
Distance from target shape to gray trapezoid at (5, 1): 7
Closest shape is the purple square at (3, 3) with distance 3</think>

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