There are 5 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 (2, 5)
Distance from target shape to orange trapezoid at (0, 1): 6
Distance from target shape to pink right_triangle at (2, 1): 4
Distance from target shape to red trapezoid at (6, 3): 6
Distance from target shape to purple rectangle at (5, 0): 8
Closest shape is the pink right_triangle at (2, 1) with distance 4</think>

<answer>(2, 1)</answer>