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]: ['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']
[A]: a, b, e, h, i, j, k, n, s, u, v, w, y


[Q]: ['g', '6867', '7965', '3313', 'k', '1827', '7337', 'u', '1209', '5145', 'w', 'h', '9059', 'u', 'b', '3189', '2837', 'k', 'y', 'e', 'b', '4479', '541', '7103', 'h', 'm', '2177', '6377', '3993', '7167', 'q', '2145', '5007', '9135', '5331', 'e']
[A]: b, e, g, h, k, m, q, u, w, y


[Q]: ['t', '6461', 'p', '3501', 'v', 's', 'r', '7521', 'q', '2829', '9137', '4403', 'j', 'd', '89', 'a', '6769', '4555', '6257', 'b', '5879', '2703', 'z', '7883', 'o', 't', 'i', '5493']
[A]:
a, b, d, i, j, o, p, q, r, s, t, v, z