There are 5 shapes on a 7x7 grid. Which shape is closest to the red right_triangle 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 right_triangle at (4, 5)
Distance from target shape to green right_triangle at (6, 5): 2
Distance from target shape to blue square at (2, 2): 5
Distance from target shape to brown rectangle at (0, 4): 5
Distance from target shape to pink square at (6, 1): 6
Closest shape is the green right_triangle at (6, 5) with distance 2</think>

<answer>(6, 5)</answer>