There are 4 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 (5, 0)
Distance from target shape to brown square at (0, 0): 5
Distance from target shape to green right_triangle at (6, 6): 7
Distance from target shape to pink square at (3, 2): 4
Closest shape is the pink square at (3, 2) with distance 4</think>

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