There are 5 shapes on a 10x10 grid. Which shape is closest to the red 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: red rectangle at (6, 4)
Distance from target shape to purple trapezoid at (3, 9): 8
Distance from target shape to cyan square at (5, 8): 5
Distance from target shape to brown square at (1, 0): 9
Distance from target shape to gray rectangle at (4, 8): 6
Closest shape is the cyan square at (5, 8) with distance 5</think>

<answer>(5, 8)</answer>