There are 3 shapes on a 10x10 grid. Which shape is closest to the gray 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: gray rectangle at (9, 5)
Distance from target shape to yellow right_triangle at (6, 4): 4
Distance from target shape to cyan trapezoid at (5, 1): 8
Closest shape is the yellow right_triangle at (6, 4) with distance 4</think>

<answer>(6, 4)</answer>