There are 3 shapes on a 7x7 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, 6)
Distance from target shape to purple rectangle at (0, 3): 8
Distance from target shape to yellow right_triangle at (5, 0): 6
Closest shape is the yellow right_triangle at (5, 0) with distance 6</think>

<answer>(5, 0)</answer>