There are 5 shapes on a 7x7 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 (5, 6)
Distance from target shape to yellow right_triangle at (4, 6): 1
Distance from target shape to green trapezoid at (6, 0): 7
Distance from target shape to pink rectangle at (2, 1): 8
Distance from target shape to red square at (0, 2): 9
Closest shape is the yellow right_triangle at (4, 6) with distance 1</think>

<answer>(4, 6)</answer>