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 (0, 0)
Distance from target shape to green trapezoid at (0, 5): 5
Distance from target shape to pink rectangle at (1, 1): 2
Distance from target shape to blue square at (3, 0): 3
Distance from target shape to yellow square at (1, 5): 6
Closest shape is the pink rectangle at (1, 1) with distance 2</think>

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