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

<answer>(2, 4)</answer>