There are 6 shapes on a 9x9 grid. Which shape is closest to the yellow 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: yellow right_triangle at (7, 4)
Distance from target shape to cyan square at (4, 4): 3
Distance from target shape to brown square at (7, 2): 2
Distance from target shape to gray right_triangle at (1, 2): 8
Distance from target shape to pink rectangle at (2, 0): 9
Distance from target shape to purple square at (8, 3): 2
Closest shape is the brown square at (7, 2) with distance 2</think>

<answer>(7, 2)</answer>