There are 3 shapes on a 6x6 grid. Which shape is closest to the brown square 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 square at (5, 3)
Distance from target shape to cyan trapezoid at (2, 5): 5
Distance from target shape to purple right_triangle at (3, 5): 4
Closest shape is the purple right_triangle at (3, 5) with distance 4</think>

<answer>(3, 5)</answer>