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.

['895', '2049', '8839', '1773', 'v', '467']
v

['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']
a, b, c, j, l, r, t, v, x

['3333', '1561', '7707', '6451', '2133', '2653', 'q', 'z', '7463', 'j', '8649', '9975', '7305', 'j', '1329', 'u', 'r', '6647']

j, q, r, u, z

