There are 2 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 (5, 5)
Distance from target shape to pink rectangle at (4, 3): 3
Closest shape is the pink rectangle at (4, 3) with distance 3</think>

<answer>(4, 3)</answer>