There are 5 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 (7, 7)
Distance from target shape to brown right_triangle at (0, 4): 10
Distance from target shape to cyan right_triangle at (3, 0): 11
Distance from target shape to yellow trapezoid at (0, 5): 9
Distance from target shape to red right_triangle at (1, 6): 7
Closest shape is the red right_triangle at (1, 6) with distance 7</think>

<answer>(1, 6)</answer>