There are 6 shapes on a 8x8 grid. Which shape is closest to the red 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: red square at (7, 5)
Distance from target shape to orange rectangle at (4, 7): 5
Distance from target shape to pink rectangle at (2, 0): 10
Distance from target shape to yellow trapezoid at (1, 4): 7
Distance from target shape to cyan square at (4, 2): 6
Distance from target shape to brown right_triangle at (5, 5): 2
Closest shape is the brown right_triangle at (5, 5) with distance 2</think>

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