There are 6 shapes on a 7x7 grid. Which shape is closest to the gray 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: gray rectangle at (0, 5)
Distance from target shape to yellow square at (4, 2): 7
Distance from target shape to purple square at (1, 6): 2
Distance from target shape to cyan rectangle at (2, 5): 2
Distance from target shape to pink trapezoid at (0, 0): 5
Distance from target shape to green square at (6, 6): 7
Closest shape is the purple square at (1, 6) with distance 2</think>

<answer>(1, 6)</answer>