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

<answer>(6, 2)</answer>