There is a four-digit number, the number in the hundreds place is "5", and the number in the ones place is "8". The sum of any three adjacent numbers is 15. Find this four-digit number.
有一个四位数，百位上的数字是"5"，个位上的数字是"8"．任意相邻的三个数字和都是15，求这个四位数．
<result>8_528</result>