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

<answer>(1, 2)</answer>