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

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