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 (0, 4)
Distance from target shape to green trapezoid at (8, 6): 10
Distance from target shape to red square at (0, 1): 3
Distance from target shape to purple trapezoid at (1, 0): 5
Closest shape is the red square at (0, 1) with distance 3</think>

<answer>(0, 1)</answer>