There are 4 shapes on a 7x7 grid. Which shape is closest to the orange 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: orange right_triangle at (2, 5)
Distance from target shape to red right_triangle at (6, 0): 9
Distance from target shape to pink square at (4, 2): 5
Distance from target shape to blue right_triangle at (2, 3): 2
Closest shape is the blue right_triangle at (2, 3) with distance 2</think>

<answer>(2, 3)</answer>