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]: ['s', 's', '6581', 'e', '7355', '1315']
[A]: e, s


[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]: ['8905', 'm', '8887', 'l', '7495', 'm', 'e', 'n', 't', 's', 's', 'h', 'a', '9517', 'o', '3371', 'j', '8063', '4609', 'y', 'k', 'u', '4095', 'p', '6145', 'h', 'p', 'y', 's', '7273', '5277', '6947', 'o', 'o', 'p', '7039', 'm', '5309', '9353', '2141', 's', 't', 'y', '4653', 'u']
[A]:
a, e, h, j, k, l, m, n, o, p, s, t, u, y