There are 6 shapes on a 3x3 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 cyan trapezoid at (0, 1): 3
Distance from target shape to orange rectangle at (2, 0): 2
Distance from target shape to blue rectangle at (1, 2): 1
Distance from target shape to red trapezoid at (1, 1): 2
Distance from target shape to gray right_triangle at (2, 1): 1
Closest shape is the blue rectangle at (1, 2) with distance 1</think>

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