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]: ['3127', '9253', '5667', '9453']
[EX A]: -1

[EX Q]: ['1063', 'f', 'm', 'i', 'x', 'i', 'd']
[EX A]: d, f, i, m, x

[EX Q]: ['w', 'e', '3779', '9879', '6765', 'f', 'a', 'n', '35', 'b', '6233', 't', '3413', '1199', '7235', '4871', '923', 'u', '5087', '4445', '8689', 'r', 'p', '1079', '3983', 's', 'h', '4395', 'x', '4921', '4019', 'v']
[EX A]:
a, b, e, f, h, n, p, r, s, t, u, v, w, x