There are 5 shapes on a 6x6 grid. Which shape is closest to the orange 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: orange right_triangle at (1, 1)
Distance from target shape to cyan square at (5, 5): 8
Distance from target shape to brown square at (0, 5): 5
Distance from target shape to green trapezoid at (1, 5): 4
Distance from target shape to yellow rectangle at (4, 0): 4
Closest shape is the green trapezoid at (1, 5) with distance 4</think>

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