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

<answer>(5, 2)</answer>