There are 4 shapes on a 7x7 grid. Which shape is closest to the red 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: red trapezoid at (5, 6)
Distance from target shape to green square at (4, 3): 4
Distance from target shape to pink trapezoid at (2, 1): 8
Distance from target shape to purple right_triangle at (1, 4): 6
Closest shape is the green square at (4, 3) with distance 4</think>

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