There are 3 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 (0, 0)
Distance from target shape to pink right_triangle at (1, 0): 1
Distance from target shape to cyan square at (2, 1): 3
Closest shape is the pink right_triangle at (1, 0) with distance 1</think>

<answer>(1, 0)</answer>