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

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