There are 5 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 (1, 2)
Distance from target shape to blue rectangle at (3, 1): 3
Distance from target shape to purple square at (4, 0): 5
Distance from target shape to cyan trapezoid at (4, 2): 3
Distance from target shape to pink right_triangle at (4, 4): 5
Closest shape is the blue rectangle at (3, 1) with distance 3</think>

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