There are 3 shapes on a 8x8 grid. Which shape is closest to the gray 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: gray rectangle at (4, 2)
Distance from target shape to red trapezoid at (4, 1): 1
Distance from target shape to green trapezoid at (2, 1): 3
Closest shape is the red trapezoid at (4, 1) with distance 1</think>

<answer>(4, 1)</answer>