There are 5 shapes on a 8x8 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 (5, 3)
Distance from target shape to yellow rectangle at (7, 1): 4
Distance from target shape to red right_triangle at (5, 7): 4
Distance from target shape to green square at (7, 2): 3
Distance from target shape to brown rectangle at (7, 0): 5
Closest shape is the green square at (7, 2) with distance 3</think>

<answer>(7, 2)</answer>