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, 1)
Distance from target shape to green trapezoid at (2, 4): 6
Distance from target shape to brown rectangle at (1, 5): 8
Distance from target shape to gray rectangle at (7, 4): 5
Distance from target shape to cyan rectangle at (2, 2): 4
Closest shape is the cyan rectangle at (2, 2) with distance 4</think>

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