There are 3 shapes on a 7x7 grid. Which shape is closest to the red rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: red rectangle at (1, 4)
Distance from target shape to yellow trapezoid at (5, 0): 8
Distance from target shape to pink trapezoid at (4, 3): 4
Closest shape is the pink trapezoid at (4, 3) with distance 4</think>

<answer>(4, 3)</answer>