There are 5 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 (4, 4)
Distance from target shape to yellow rectangle at (0, 6): 6
Distance from target shape to green right_triangle at (3, 4): 1
Distance from target shape to orange trapezoid at (1, 2): 5
Distance from target shape to gray trapezoid at (0, 3): 5
Closest shape is the green right_triangle at (3, 4) with distance 1</think>

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