There are 2 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 (8, 1)
Distance from target shape to red rectangle at (1, 4): 10
Closest shape is the red rectangle at (1, 4) with distance 10</think>

<answer>(1, 4)</answer>