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 (4, 2)
Distance from target shape to brown square at (1, 3): 4
Distance from target shape to green square at (6, 2): 2
Distance from target shape to yellow trapezoid at (6, 1): 3
Distance from target shape to red trapezoid at (5, 4): 3
Distance from target shape to blue rectangle at (1, 6): 7
Closest shape is the green square at (6, 2) with distance 2</think>

<answer>(6, 2)</answer>