There are 3 shapes on a 9x9 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 (7, 5)
Distance from target shape to gray right_triangle at (6, 4): 2
Distance from target shape to blue square at (3, 2): 7
Closest shape is the gray right_triangle at (6, 4) with distance 2</think>

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