There are five number cards 0, 3, 7, 8, and 9. Take 4 of them and arrange them into four-digit numbers. Arrange the numbers that can only be divisible by 9 in descending order. Then the third number is How many.
有0、3、7、8、9五张数字卡片，从中取出4张排成四位数，把其中只能被9整除的数按从大到小的顺序排列起来，那么第三个数是多少．
<result>9_783</result>