There are 6 shapes on a 8x8 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 (4, 5)
Distance from target shape to yellow right_triangle at (7, 2): 6
Distance from target shape to green square at (3, 3): 3
Distance from target shape to purple rectangle at (7, 1): 7
Distance from target shape to gray right_triangle at (5, 0): 6
Distance from target shape to blue right_triangle at (4, 0): 5
Closest shape is the green square at (3, 3) with distance 3</think>

<answer>(3, 3)</answer>