There are 4 shapes on a 8x8 grid. Which shape is closest to the pink 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: pink trapezoid at (1, 7)
Distance from target shape to red square at (7, 0): 13
Distance from target shape to cyan right_triangle at (7, 1): 12
Distance from target shape to yellow trapezoid at (5, 3): 8
Closest shape is the yellow trapezoid at (5, 3) with distance 8</think>

<answer>(5, 3)</answer>