There are 5 shapes on a 9x9 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 (3, 4)
Distance from target shape to green square at (6, 6): 5
Distance from target shape to red square at (1, 3): 3
Distance from target shape to orange rectangle at (5, 7): 5
Distance from target shape to cyan trapezoid at (6, 1): 6
Closest shape is the red square at (1, 3) with distance 3</think>

<answer>(1, 3)</answer>