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

<answer>(2, 0)</answer>