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

<answer>(3, 1)</answer>