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

<answer>(1, 4)</answer>