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 (3, 1)
Distance from target shape to brown rectangle at (1, 0): 3
Distance from target shape to blue right_triangle at (5, 3): 4
Distance from target shape to green right_triangle at (1, 3): 4
Closest shape is the brown rectangle at (1, 0) with distance 3</think>

<answer>(1, 0)</answer>