There are 4 shapes on a 8x8 grid. Which shape is closest to the red 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: red rectangle at (4, 7)
Distance from target shape to cyan rectangle at (0, 5): 6
Distance from target shape to gray trapezoid at (3, 4): 4
Distance from target shape to pink square at (3, 2): 6
Closest shape is the gray trapezoid at (3, 4) with distance 4</think>

<answer>(3, 4)</answer>