There are 4 shapes on a 7x7 grid. Which shape is closest to the gray square 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 square at (6, 4)
Distance from target shape to yellow square at (5, 4): 1
Distance from target shape to orange right_triangle at (1, 0): 9
Distance from target shape to brown trapezoid at (4, 5): 3
Closest shape is the yellow square at (5, 4) with distance 1</think>

<answer>(5, 4)</answer>