There are 5 shapes on a 7x7 grid. Which shape is closest to the yellow 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: yellow right_triangle at (2, 2)
Distance from target shape to brown rectangle at (3, 1): 2
Distance from target shape to pink square at (4, 5): 5
Distance from target shape to cyan rectangle at (3, 5): 4
Distance from target shape to red right_triangle at (2, 1): 1
Closest shape is the red right_triangle at (2, 1) with distance 1</think>

<answer>(2, 1)</answer>