Xiaohong has a movie ticket. The product of the row number and the seat number of this ticket is 391, and the row number is 6 larger than the seat number. How many rows are Xiaohong's movie tickets?
小红有一张电影票，这张票的排数和座位号数的乘积是391，而且排数比座位号数大6．小红的电影票是多少排．
<result>23</result>