Q: 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.
['9293', 'g', 'e', '7285', '3123', '1019', '93', '6675', 'z', 't', '9649', 'p', '8089', 'r', '5915', 'u', 'g', 'm', 's', 'l']
A:
e, g, l, m, p, r, s, t, u, z