There are 6 shapes on a 8x8 grid. Which shape is closest to the blue 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: blue trapezoid at (6, 3)
Distance from target shape to brown square at (1, 6): 8
Distance from target shape to gray trapezoid at (4, 2): 3
Distance from target shape to pink right_triangle at (4, 1): 4
Distance from target shape to cyan square at (2, 7): 8
Distance from target shape to orange right_triangle at (1, 1): 7
Closest shape is the gray trapezoid at (4, 2) with distance 3</think>

<answer>(4, 2)</answer>