There are 3 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 (3, 3)
Distance from target shape to gray right_triangle at (5, 0): 5
Distance from target shape to cyan square at (6, 5): 5
Closest shape is the gray right_triangle at (5, 0) with distance 5</think>

<answer>(5, 0)</answer>