There are 6 shapes on a 5x5 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 (4, 4)
Distance from target shape to red square at (1, 0): 7
Distance from target shape to purple right_triangle at (2, 1): 5
Distance from target shape to gray rectangle at (3, 1): 4
Distance from target shape to pink trapezoid at (1, 2): 5
Distance from target shape to blue square at (1, 3): 4
Closest shape is the gray rectangle at (3, 1) with distance 4</think>

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