There are 3 shapes on a 4x4 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 (3, 0)
Distance from target shape to brown square at (2, 2): 3
Distance from target shape to pink trapezoid at (3, 3): 3
Closest shape is the brown square at (2, 2) with distance 3</think>

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