There are 5 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 (3, 4)
Distance from target shape to green square at (5, 4): 2
Distance from target shape to purple right_triangle at (5, 3): 3
Distance from target shape to blue trapezoid at (1, 2): 4
Distance from target shape to gray rectangle at (0, 1): 6
Closest shape is the green square at (5, 4) with distance 2</think>

<answer>(5, 4)</answer>