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.

[EX Q]: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']
[EX A]: e, f, g, h, k, q, u, z

[EX Q]: ['7591', '1403']
[EX A]: -1

[EX Q]: ['7071', 'm', '5683', '7831', 'c', '3773', 's', 'q', 'g', 'p', '8691', '9657', 'y', 'j', 'e', '2797', '9623', '4859', '837', 'k', 'e']
[EX A]:
c, e, g, j, k, m, p, q, s, y