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

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