There are 6 shapes on a 7x7 grid. Which shape is closest to the purple square 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 square at (6, 2)
Distance from target shape to cyan trapezoid at (2, 2): 4
Distance from target shape to pink square at (4, 4): 4
Distance from target shape to green square at (4, 0): 4
Distance from target shape to blue square at (1, 6): 9
Distance from target shape to brown trapezoid at (4, 3): 3
Closest shape is the brown trapezoid at (4, 3) with distance 3</think>

<answer>(4, 3)</answer>