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]: ['7065', 'q', 't', '3177', '9035', 'i', 'l', 'd', '8961', '1183', '6507', 'u', 'c', 't', '2467', '7659', 'e', '8963', 'j', 'g', 'p', '6779', '7115']
[EX A]: c, d, e, g, i, j, l, p, q, t, u

[EX Q]: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']
[EX A]: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y

[EX Q]: ['6367', 'n', '2611', '8923', 'n', 'w', 'e', '7357', '3101', 'z', '6491', 'b', '2401', 'v', '9827', 'c', 'w', '4951', 'm', '7403']
[EX A]:
b, c, e, m, n, v, w, z