There are 5 shapes on a 6x6 grid. Which shape is closest to the red 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: red trapezoid at (3, 1)
Distance from target shape to green square at (0, 5): 7
Distance from target shape to gray rectangle at (4, 1): 1
Distance from target shape to pink rectangle at (4, 5): 5
Distance from target shape to orange trapezoid at (0, 2): 4
Closest shape is the gray rectangle at (4, 1) with distance 1</think>

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