There are 4 shapes on a 6x6 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 (4, 0)
Distance from target shape to yellow right_triangle at (1, 2): 5
Distance from target shape to green rectangle at (0, 1): 5
Distance from target shape to pink rectangle at (5, 4): 5
Closest shape is the yellow right_triangle at (1, 2) with distance 5</think>

<answer>(1, 2)</answer>