There are 5 shapes on a 7x7 grid. Which shape is closest to the pink 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: pink rectangle at (4, 2)
Distance from target shape to brown right_triangle at (2, 6): 6
Distance from target shape to blue trapezoid at (1, 3): 4
Distance from target shape to green trapezoid at (3, 4): 3
Distance from target shape to red square at (4, 5): 3
Closest shape is the green trapezoid at (3, 4) with distance 3</think>

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