There are 3 shapes on a 7x7 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 (5, 4)
Distance from target shape to yellow right_triangle at (1, 1): 7
Distance from target shape to green rectangle at (6, 4): 1
Closest shape is the green rectangle at (6, 4) with distance 1</think>

<answer>(6, 4)</answer>