There are 5 shapes on a 10x10 grid. Which shape is closest to the red 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: red trapezoid at (8, 1)
Distance from target shape to green rectangle at (4, 6): 9
Distance from target shape to gray right_triangle at (6, 1): 2
Distance from target shape to cyan right_triangle at (2, 0): 7
Distance from target shape to purple square at (8, 4): 3
Closest shape is the gray right_triangle at (6, 1) with distance 2</think>

<answer>(6, 1)</answer>