There are 5 shapes on a 8x8 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 (3, 7)
Distance from target shape to pink square at (2, 3): 5
Distance from target shape to yellow square at (3, 5): 2
Distance from target shape to gray right_triangle at (1, 2): 7
Distance from target shape to brown trapezoid at (7, 7): 4
Closest shape is the yellow square at (3, 5) with distance 2</think>

<answer>(3, 5)</answer>