There are 6 shapes on a 7x7 grid. Which shape is closest to the cyan 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: cyan right_triangle at (4, 2)
Distance from target shape to gray square at (1, 0): 5
Distance from target shape to yellow rectangle at (0, 6): 8
Distance from target shape to green square at (6, 3): 3
Distance from target shape to brown trapezoid at (2, 3): 3
Distance from target shape to red right_triangle at (0, 5): 7
Closest shape is the green square at (6, 3) with distance 3</think>

<answer>(6, 3)</answer>