There are 6 shapes on a 4x4 grid. Which shape is closest to the brown trapezoid 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 trapezoid at (2, 3)
Distance from target shape to blue right_triangle at (1, 3): 1
Distance from target shape to gray rectangle at (3, 2): 2
Distance from target shape to red rectangle at (3, 0): 4
Distance from target shape to cyan right_triangle at (2, 2): 1
Distance from target shape to orange square at (2, 0): 3
Closest shape is the blue right_triangle at (1, 3) with distance 1</think>

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