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

<answer>(2, 1)</answer>