There are 3 shapes on a 7x7 grid. Which shape is closest to the cyan trapezoid 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 trapezoid at (3, 1)
Distance from target shape to gray right_triangle at (6, 4): 6
Distance from target shape to yellow right_triangle at (6, 1): 3
Closest shape is the yellow right_triangle at (6, 1) with distance 3</think>

<answer>(6, 1)</answer>