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]: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']
[EX A]: d, e, g, l, m, o, p, q, s, t, v

[EX Q]: ['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']
[EX A]: d, e, k, l, o, s, t, u, w, y

[EX Q]: ['6139', 'b', '5223', '8389', 'l', '635', '7365', '873', '9609', 'k', '8531', '5375', 'l', '4191', 'm']
[EX A]:
b, k, l, m