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

<answer>(2, 4)</answer>