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

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