There are 4 shapes on a 7x7 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 green right_triangle at (2, 1): 6
Distance from target shape to gray right_triangle at (5, 5): 5
Distance from target shape to orange right_triangle at (1, 1): 5
Closest shape is the gray right_triangle at (5, 5) with distance 5</think>

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