There are 3 shapes on a 6x6 grid. Which shape is closest to the red rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: red rectangle at (0, 3)
Distance from target shape to green square at (0, 4): 1
Distance from target shape to brown trapezoid at (1, 3): 1
Closest shape is the green square at (0, 4) with distance 1</think>

<answer>(0, 4)</answer>