There are 3 shapes on a 6x6 grid. Which shape is closest to the orange rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: orange rectangle at (4, 2)
Distance from target shape to pink right_triangle at (5, 1): 2
Distance from target shape to blue rectangle at (5, 3): 2
Closest shape is the pink right_triangle at (5, 1) with distance 2</think>

<answer>(5, 1)</answer>