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

<answer>(4, 1)</answer>