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]: ['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']
[EX A]: a, b, c, d, e, g, h, q, u, w, y, z

[EX Q]: ['p', '4329', '2437', '6279', 'u', '459', 'f', 'c', 'i', 'w', 'n', 't', '429', 'n', '73', '4995', 'p', 'z', '8459', '6133', 'y', 'r', '4057', 'a', '2717', '7803', 'r', 'm', '2879', '6989', '7223', 'v', '7929']
[EX A]: a, c, f, i, m, n, p, r, t, u, v, w, y, z

[EX Q]: ['7457', 'l', '1607', '133', 'j', 'm', '5811', 'd', 'x', 'g', '8623', 'z', '9349', 'u', '6841', 't', '5327', '9569', '8835', '3969', 'z', '1523', '3899', 'u', '4409', '9673', '3533', '8093', '6133']
[EX A]:
d, g, j, l, m, t, u, x, z