There are 5 shapes on a 7x7 grid. Which shape is closest to the blue 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: blue trapezoid at (4, 3)
Distance from target shape to yellow rectangle at (1, 5): 5
Distance from target shape to red rectangle at (1, 0): 6
Distance from target shape to cyan trapezoid at (0, 2): 5
Distance from target shape to gray rectangle at (3, 0): 4
Closest shape is the gray rectangle at (3, 0) with distance 4</think>

<answer>(3, 0)</answer>