There are 5 shapes on a 6x6 grid. Which shape is closest to the cyan 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: cyan right_triangle at (1, 3)
Distance from target shape to purple rectangle at (4, 1): 5
Distance from target shape to yellow trapezoid at (2, 0): 4
Distance from target shape to brown rectangle at (1, 1): 2
Distance from target shape to green right_triangle at (5, 1): 6
Closest shape is the brown rectangle at (1, 1) with distance 2</think>

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