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

<answer>(5, 4)</answer>