There are 4 shapes on a 10x10 grid. Which shape is closest to the gray 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: gray square at (7, 8)
Distance from target shape to yellow right_triangle at (5, 7): 3
Distance from target shape to green trapezoid at (2, 9): 6
Distance from target shape to pink square at (8, 0): 9
Closest shape is the yellow right_triangle at (5, 7) with distance 3</think>

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