There are 5 shapes on a 8x8 grid. Which shape is closest to the yellow 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: yellow trapezoid at (7, 1)
Distance from target shape to gray rectangle at (3, 1): 4
Distance from target shape to purple trapezoid at (2, 5): 9
Distance from target shape to pink square at (1, 3): 8
Distance from target shape to brown right_triangle at (0, 2): 8
Closest shape is the gray rectangle at (3, 1) with distance 4</think>

<answer>(3, 1)</answer>