There are 4 shapes on a 7x7 grid. Which shape is closest to the gray 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: gray right_triangle at (4, 3)
Distance from target shape to yellow right_triangle at (2, 2): 3
Distance from target shape to orange right_triangle at (0, 5): 6
Distance from target shape to blue rectangle at (5, 5): 3
Closest shape is the yellow right_triangle at (2, 2) with distance 3</think>

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