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]: ['5431', 'o', 'u', 'l', 'f', 'd', 'r', '1479', '9357', 's', 'v', '6399', 'b', '7937', 't', '8497', 'r', '131', 'h', 'c', 'v', '8879', 'k', 'r', '4687', 'l', '1065', 'r', 'w', 'l', '3305', '461', 'q', 'h', 'b', 'e', 'e', 'w', '5999']
[A]: b, c, d, e, f, h, k, l, o, q, r, s, t, u, v, w


[Q]: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']
[A]: c, g, l, n, r, u, v, w, z


[Q]: ['l', 'f', '839', 'c', 'g', '817', 'w', 't', 'f', 'c', '1535', '1445', 'p', 't', 'n', '9697', 'l', '2157', 'k', '4383', 'l']
[A]:
c, f, g, k, l, n, p, t, w