There are 5 shapes on a 8x8 grid. Which shape is closest to the yellow rectangle 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 rectangle at (3, 4)
Distance from target shape to cyan right_triangle at (7, 0): 8
Distance from target shape to red trapezoid at (6, 7): 6
Distance from target shape to gray right_triangle at (2, 2): 3
Distance from target shape to brown rectangle at (0, 4): 3
Closest shape is the gray right_triangle at (2, 2) with distance 3</think>

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