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.

[Q]: ['7591', '1403']
[A]: -1


[Q]: ['r', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']
[A]: a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y


[Q]: ['r', '7295', '5809', 'h', '5961', 's', 't', '1819', 'o', 'o', 'k', 'k', '2473', 'a', 'h', 'q', '1385', '4507', '1567', '5', 's', 'r', 'u', 'f', 't', 'v', 'j', '9189', '8267', 'i', 'j', 'a', 'j', '5873', '7439', '9201', 'a', '5913', '6189', 'j', 's', 'i', 'n', 'x', 'g']
[A]:
a, f, g, h, i, j, k, n, o, q, r, s, t, u, v, x