For a three-digit number, the number in the tens place is 5, and the sum of the numbers in the hundreds and ones place is 9. This three-digit number is 99 greater than its reverse number. Find this three-digit number. (Note: The inverse of a three-digit \overline{abc} is \overline{cba}).
一个三位数，十位上的数字是5，百位与个位上数字之和是9，这个三位数比它的反序数大99，求这个三位数．(注：一个三位数\overline{abc}的反序数是\overline{cba})．
<result>554</result>