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

<answer>(4, 1)</answer>