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

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