There are 6 shapes on a 3x3 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, 1)
Distance from target shape to green rectangle at (1, 0): 1
Distance from target shape to pink trapezoid at (2, 0): 2
Distance from target shape to yellow right_triangle at (0, 2): 2
Distance from target shape to red right_triangle at (0, 0): 2
Distance from target shape to gray right_triangle at (0, 1): 1
Closest shape is the green rectangle at (1, 0) with distance 1</think>

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