There are 5 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 (4, 2)
Distance from target shape to pink rectangle at (5, 6): 5
Distance from target shape to purple square at (1, 1): 4
Distance from target shape to cyan rectangle at (6, 6): 6
Distance from target shape to blue trapezoid at (2, 3): 3
Closest shape is the blue trapezoid at (2, 3) with distance 3</think>

<answer>(2, 3)</answer>