There are 4 shapes on a 8x8 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 (4, 1)
Distance from target shape to pink right_triangle at (5, 2): 2
Distance from target shape to red trapezoid at (6, 6): 7
Distance from target shape to gray square at (6, 3): 4
Closest shape is the pink right_triangle at (5, 2) with distance 2</think>

<answer>(5, 2)</answer>