<image> As shown in the figure, a 9×9 grid is divided by bold lines into 9 "mini-grid" sections, each with 3 squares horizontally and vertically. Some squares are filled with numbers from 1 to 9. Xiao Ming fills each empty square in the ninth row with a positive integer not exceeding 9, ensuring that the numbers in each row, each column, and each "mini-grid" section do not repeat. Xiao Ming then writes the numbers in the ninth row from left to right to form a 9-digit number. Please write down this 9-digit number (_____).