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 (6, 6)
Distance from target shape to yellow trapezoid at (0, 5): 7
Distance from target shape to blue right_triangle at (6, 4): 2
Distance from target shape to cyan square at (3, 5): 4
Distance from target shape to red rectangle at (4, 1): 7
Distance from target shape to gray right_triangle at (4, 2): 6
Closest shape is the blue right_triangle at (6, 4) with distance 2</think>

<answer>(6, 4)</answer>