There are 5 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 (0, 1)
Distance from target shape to brown trapezoid at (6, 1): 6
Distance from target shape to gray rectangle at (1, 0): 2
Distance from target shape to yellow rectangle at (5, 1): 5
Distance from target shape to pink right_triangle at (4, 1): 4
Closest shape is the gray rectangle at (1, 0) with distance 2</think>

<answer>(1, 0)</answer>