There are 4 shapes on a 7x7 grid. Which shape is closest to the blue 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: blue square at (4, 6)
Distance from target shape to orange right_triangle at (0, 5): 5
Distance from target shape to purple trapezoid at (0, 4): 6
Distance from target shape to pink right_triangle at (2, 4): 4
Closest shape is the pink right_triangle at (2, 4) with distance 4</think>

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