There are 3 shapes on a 8x8 grid. Which shape is closest to the gray 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: gray square at (7, 4)
Distance from target shape to orange right_triangle at (6, 3): 2
Distance from target shape to blue square at (7, 3): 1
Closest shape is the blue square at (7, 3) with distance 1</think>

<answer>(7, 3)</answer>