There are 6 shapes on a 7x7 grid. Which shape is closest to the cyan 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: cyan right_triangle at (0, 5)
Distance from target shape to yellow rectangle at (2, 5): 2
Distance from target shape to green rectangle at (0, 4): 1
Distance from target shape to orange trapezoid at (3, 4): 4
Distance from target shape to purple right_triangle at (3, 6): 4
Distance from target shape to red rectangle at (4, 5): 4
Closest shape is the green rectangle at (0, 4) with distance 1</think>

<answer>(0, 4)</answer>