There are 5 shapes on a 10x10 grid. Which shape is closest to the gray 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: gray trapezoid at (7, 8)
Distance from target shape to pink trapezoid at (3, 9): 5
Distance from target shape to orange rectangle at (0, 0): 15
Distance from target shape to red right_triangle at (5, 1): 9
Distance from target shape to cyan right_triangle at (9, 5): 5
Closest shape is the pink trapezoid at (3, 9) with distance 5</think>

<answer>(3, 9)</answer>