There are 6 shapes on a 4x4 grid. Which shape is closest to the brown 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: brown right_triangle at (3, 3)
Distance from target shape to green rectangle at (0, 3): 3
Distance from target shape to red trapezoid at (2, 2): 2
Distance from target shape to purple square at (1, 3): 2
Distance from target shape to blue rectangle at (2, 0): 4
Distance from target shape to yellow rectangle at (1, 0): 5
Closest shape is the red trapezoid at (2, 2) with distance 2</think>

<answer>(2, 2)</answer>