There are 3 shapes on a 6x6 grid. Which shape is closest to the red right_triangle 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 right_triangle at (4, 2)
Distance from target shape to pink trapezoid at (0, 1): 5
Distance from target shape to yellow rectangle at (3, 0): 3
Closest shape is the yellow rectangle at (3, 0) with distance 3</think>

<answer>(3, 0)</answer>