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

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