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]: ['4299', 'b', '4171', '7639', '6609', '927', '5249', 'o', 'p', '9851', 'e', '1311', '3777', '7799', '7687', '8809', 'c', 'r', '47', '1925', '1847', 'r', 'd', 'r', '1871', '5935', 'r', '2283', 'p', 'p', '2727', 'c', 'i', '7357', 'y', '5103', '6115', 'q', 'w', 'u', '9201', '4221', '7717', 'o']
[EX A]: b, c, d, e, i, o, p, q, r, u, w, y

[EX Q]: ['p', '6263', '2377', '6463', 'g', 'q', '4451', '4491', 'z', '7731', '6575', '6307', 'y', '8435', 'k', 'y', 'p', 'k', '5035', 'w', 'x', 'l', 'x']
[EX A]:
g, k, l, p, q, w, x, y, z