There are 5 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 (1, 6)
Distance from target shape to brown right_triangle at (3, 7): 3
Distance from target shape to pink rectangle at (5, 5): 5
Distance from target shape to yellow rectangle at (1, 4): 2
Distance from target shape to purple rectangle at (4, 7): 4
Closest shape is the yellow rectangle at (1, 4) with distance 2</think>

<answer>(1, 4)</answer>