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

<answer>(2, 4)</answer>