There are 6 shapes on a 8x8 grid. Which shape is closest to the yellow square 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 square at (7, 1)
Distance from target shape to green square at (2, 1): 5
Distance from target shape to pink right_triangle at (3, 5): 8
Distance from target shape to red trapezoid at (4, 1): 3
Distance from target shape to cyan square at (0, 6): 12
Distance from target shape to purple trapezoid at (7, 5): 4
Closest shape is the red trapezoid at (4, 1) with distance 3</think>

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