There are 4 shapes on a 8x8 grid. Which shape is closest to the yellow square in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: yellow square at (6, 5)
Distance from target shape to pink right_triangle at (7, 2): 4
Distance from target shape to blue trapezoid at (6, 1): 4
Distance from target shape to red square at (5, 2): 4
Closest shape is the pink right_triangle at (7, 2) with distance 4</think>

<answer>(7, 2)</answer>