There are 5 shapes on a 5x5 grid. Which shape is closest to the pink 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: pink right_triangle at (2, 1)
Distance from target shape to gray square at (1, 3): 3
Distance from target shape to cyan right_triangle at (0, 4): 5
Distance from target shape to orange right_triangle at (0, 1): 2
Distance from target shape to green square at (4, 1): 2
Closest shape is the orange right_triangle at (0, 1) with distance 2</think>

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