There are 6 shapes on a 9x9 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, 4)
Distance from target shape to pink right_triangle at (5, 1): 7
Distance from target shape to green rectangle at (3, 1): 5
Distance from target shape to brown square at (1, 8): 4
Distance from target shape to blue square at (1, 7): 3
Distance from target shape to gray rectangle at (2, 6): 3
Closest shape is the blue square at (1, 7) with distance 3</think>

<answer>(1, 7)</answer>