There are 5 shapes on a 8x8 grid. Which shape is closest to the brown 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: brown square at (3, 3)
Distance from target shape to yellow square at (1, 3): 2
Distance from target shape to blue square at (4, 7): 5
Distance from target shape to orange right_triangle at (5, 4): 3
Distance from target shape to gray square at (3, 4): 1
Closest shape is the gray square at (3, 4) with distance 1</think>

<answer>(3, 4)</answer>