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 (4, 2)
Distance from target shape to green right_triangle at (5, 1): 2
Distance from target shape to orange square at (3, 1): 2
Distance from target shape to blue trapezoid at (5, 4): 3
Distance from target shape to cyan right_triangle at (2, 4): 4
Closest shape is the green right_triangle at (5, 1) with distance 2</think>

<answer>(5, 1)</answer>