There are 6 shapes on a 7x7 grid. Which shape is closest to the purple 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: purple trapezoid at (5, 4)
Distance from target shape to gray trapezoid at (4, 5): 2
Distance from target shape to orange rectangle at (3, 2): 4
Distance from target shape to blue trapezoid at (3, 6): 4
Distance from target shape to cyan rectangle at (6, 1): 4
Distance from target shape to brown square at (2, 5): 4
Closest shape is the gray trapezoid at (4, 5) with distance 2</think>

<answer>(4, 5)</answer>