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 (5, 3)
Distance from target shape to yellow right_triangle at (3, 3): 2
Distance from target shape to gray square at (2, 2): 4
Distance from target shape to blue rectangle at (5, 2): 1
Distance from target shape to orange right_triangle at (0, 1): 7
Closest shape is the blue rectangle at (5, 2) with distance 1</think>

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