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

<answer>(1, 5)</answer>