2003 students line up in a row from front to back, and report the number according to the following rules. If the number reported by a student is a one-digit number, the students behind will report the sum of this number and 9. If the number reported by a student is If it is a two-digit number, the students behind will report the sum of the single digit of this number and 6. Now let the first student report 2, then what is the number reported by the last student.
2003名学生从前往后排成一列，按下面的规则报数，如果某个同学报的数是一位数，后面的同学就在报出这个数与9的和，如果某个同学报的数是二位数，后面的同学就要报出这个数的个位数与6的和，现让第一个同学报2，那么最后一个同学所报的数是多少．
<result>15</result>