Detailed Instructions: In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.
Q: ['5789', 'e', '4041', '4273', '7783', '5165', 'h', '5059', 'r', '23', '9889', 'o', '9011', '6159', '9769', '665', 'e']
A:
e, h, o, r