There are 6 shapes on a 10x10 grid. Which shape is closest to the red 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: red square at (3, 9)
Distance from target shape to yellow rectangle at (4, 2): 8
Distance from target shape to pink square at (4, 3): 7
Distance from target shape to orange rectangle at (6, 1): 11
Distance from target shape to blue rectangle at (0, 3): 9
Distance from target shape to cyan trapezoid at (7, 9): 4
Closest shape is the cyan trapezoid at (7, 9) with distance 4</think>

<answer>(7, 9)</answer>