There are 2 shapes on a 4x4 grid. Which shape is closest to the green 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: green right_triangle at (2, 2)
Distance from target shape to red trapezoid at (2, 1): 1
Closest shape is the red trapezoid at (2, 1) with distance 1</think>

<answer>(2, 1)</answer>