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

<answer>(2, 3)</answer>