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]: ['2741', '2541', '8943', 'l', '4047', '2211', 'p', 'e', 't', '7645', '9771', 'f', '5063', '2303', '6097', '5089', 'd', 'e', '1409', '3125', '2171', 'g', '1247', '4045', 'v', 'h', 'u', '2587', '5207', '5553', 'g', 'd', '6891', 'e', '2471', '2435']
[EX A]: d, e, f, g, h, l, p, t, u, v

[EX Q]: ['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']
[EX A]: b, f, g, j, q, r

[EX Q]: ['a', 'g', 'b', 'm', '5535', 'o', 'h', '5633', 'q', '8987', '55', 'h', '1779', '189', 't', '347', '4007', 's', '8695', '6831', 'd', '4831', '4483', '2829', '8179', 't', '6225']
[EX A]:
a, b, d, g, h, m, o, q, s, t