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

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