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.

[EX 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']
[EX A]: a, b, e, h, i, j, k, n, s, u, v, w, y

[EX Q]: ['u', '4021', 'u', 'd', 'j', 'p', 'i', 'z', '3223', 'f', 's', 'l', 'p', 'd', '5031', '1059', '7875', '2097', 'q', 'i', '8813', '2017', 'h', 'l', 'y', '57', '1561', 'f', 'j', 'z', '1901', 'u', 'j', 'x', '6561', '9239', '3333', '8793', '4915', '5821', 'h', 'f', '765', 'x']
[EX A]: d, f, h, i, j, l, p, q, s, u, x, y, z

[EX Q]: ['m', 'r', 'u', 'l', 's', '2563', '8109', '2367', 't', '6257', 'u', 'r', '7043', 'q', 'k', '7683', '3823', 'k', '8363', '1163', '5315', '1187', 'w', 'd', 'j', 's', 'k', '2897', '2561', 'z', 'i', 't', '1285', 'r', '859']
[EX A]:
d, i, j, k, l, m, q, r, s, t, u, w, z