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

<answer>(2, 0)</answer>