There are 4 shapes on a 10x10 grid. Which shape is closest to the blue trapezoid in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: blue trapezoid at (5, 4)
Distance from target shape to brown square at (6, 4): 1
Distance from target shape to purple rectangle at (9, 0): 8
Distance from target shape to gray right_triangle at (4, 1): 4
Closest shape is the brown square at (6, 4) with distance 1</think>

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