There are 6 shapes on a 8x8 grid. Which shape is closest to the orange rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: orange rectangle at (1, 2)
Distance from target shape to yellow rectangle at (1, 6): 4
Distance from target shape to cyan right_triangle at (4, 4): 5
Distance from target shape to pink rectangle at (5, 3): 5
Distance from target shape to gray square at (0, 4): 3
Distance from target shape to red right_triangle at (0, 5): 4
Closest shape is the gray square at (0, 4) with distance 3</think>

<answer>(0, 4)</answer>