There are 3 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 (3, 6)
Distance from target shape to brown trapezoid at (6, 1): 8
Distance from target shape to yellow trapezoid at (2, 4): 3
Closest shape is the yellow trapezoid at (2, 4) with distance 3</think>

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