There are 5 shapes on a 10x10 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, 2)
Distance from target shape to gray right_triangle at (9, 4): 10
Distance from target shape to yellow square at (7, 7): 11
Distance from target shape to blue rectangle at (8, 9): 14
Distance from target shape to red rectangle at (5, 3): 5
Closest shape is the red rectangle at (5, 3) with distance 5</think>

<answer>(5, 3)</answer>