There are 6 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 (3, 2)
Distance from target shape to pink square at (3, 1): 1
Distance from target shape to gray square at (4, 1): 2
Distance from target shape to yellow right_triangle at (0, 1): 4
Distance from target shape to blue right_triangle at (4, 4): 3
Distance from target shape to purple trapezoid at (4, 3): 2
Closest shape is the pink square at (3, 1) with distance 1</think>

<answer>(3, 1)</answer>