There are 5 shapes on a 9x9 grid. Which shape is closest to the blue 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: blue square at (2, 4)
Distance from target shape to pink right_triangle at (7, 2): 7
Distance from target shape to yellow trapezoid at (4, 8): 6
Distance from target shape to gray trapezoid at (1, 2): 3
Distance from target shape to purple square at (8, 1): 9
Closest shape is the gray trapezoid at (1, 2) with distance 3</think>

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