There are 6 shapes on a 6x6 grid. Which shape is closest to the red 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: red square at (2, 4)
Distance from target shape to blue square at (4, 5): 3
Distance from target shape to green right_triangle at (4, 0): 6
Distance from target shape to pink right_triangle at (0, 1): 5
Distance from target shape to yellow square at (0, 3): 3
Distance from target shape to brown right_triangle at (2, 5): 1
Closest shape is the brown right_triangle at (2, 5) with distance 1</think>

<answer>(2, 5)</answer>