There are 3 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 green rectangle at (1, 1): 1
Distance from target shape to cyan rectangle at (1, 3): 3
Closest shape is the green rectangle at (1, 1) with distance 1</think>

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