There are 4 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 (5, 9)
Distance from target shape to red square at (1, 9): 4
Distance from target shape to cyan square at (7, 3): 8
Distance from target shape to blue rectangle at (7, 6): 5
Closest shape is the red square at (1, 9) with distance 4</think>

<answer>(1, 9)</answer>