There are 4 shapes on a 10x10 grid. Which shape is closest to the pink rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: pink rectangle at (1, 4)
Distance from target shape to purple right_triangle at (3, 6): 4
Distance from target shape to orange square at (2, 1): 4
Distance from target shape to gray trapezoid at (3, 2): 4
Closest shape is the purple right_triangle at (3, 6) with distance 4</think>

<answer>(3, 6)</answer>