There are 5 shapes on a 7x7 grid. Which shape is closest to the gray square 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 square at (4, 3)
Distance from target shape to green square at (4, 4): 1
Distance from target shape to cyan trapezoid at (3, 6): 4
Distance from target shape to yellow rectangle at (2, 5): 4
Distance from target shape to red rectangle at (0, 5): 6
Closest shape is the green square at (4, 4) with distance 1</think>

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