There are 6 shapes on a 10x10 grid. Which shape is closest to the green 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: green square at (7, 8)
Distance from target shape to cyan rectangle at (7, 5): 3
Distance from target shape to pink right_triangle at (4, 6): 5
Distance from target shape to brown rectangle at (7, 4): 4
Distance from target shape to gray rectangle at (8, 2): 7
Distance from target shape to blue trapezoid at (0, 0): 15
Closest shape is the cyan rectangle at (7, 5) with distance 3</think>

<answer>(7, 5)</answer>