There are four different integers, their average is 13.75, the average of three large numbers is 15, and the average of three small numbers is 12. If the second largest number is odd, what is it
有四个不同的整数，它们的平均数是13.75，三个大数的平均数是15，三个小数的平均数是12．如果第二个大的数是奇数，那么它是多少
<result>15</result>