There are 6 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 (1, 1)
Distance from target shape to brown trapezoid at (8, 8): 14
Distance from target shape to orange square at (8, 3): 9
Distance from target shape to blue square at (4, 8): 10
Distance from target shape to red rectangle at (1, 7): 6
Distance from target shape to yellow right_triangle at (1, 3): 2
Closest shape is the yellow right_triangle at (1, 3) with distance 2</think>

<answer>(1, 3)</answer>