There are 5 shapes on a 6x6 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 (2, 2)
Distance from target shape to blue rectangle at (1, 1): 2
Distance from target shape to pink square at (3, 4): 3
Distance from target shape to orange right_triangle at (5, 2): 3
Distance from target shape to green square at (4, 2): 2
Closest shape is the blue rectangle at (1, 1) with distance 2</think>

<answer>(1, 1)</answer>