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: ['8357', 'x', 'w', '287', 'z', '2733', '1757', 'w', 'g', '1393', '7201', '4931', 'k', '5185', 'x', '6313', '2255', 'z', 'v', '3593', '6191', '4423', 'm', 'k', '3209', '3559', 'c', 'n', 'm', '5461', '2997', '235', '4045', '6597', 'v', 'e', 'p', 'c', 'k', 'd', '5529', '6241', 'u', 'f', '8067']

A: c, d, e, f, g, k, m, n, p, u, v, w, x, z
****
Q: ['3411', 'a', 'v', 'j', '8925', '909', 'h', 'l', 'r', '1371', 'u', '7789', '4813', 'u', 'q', 'i', '8473', 'n', '7191', 'c', '4641', 'e', '5107', 'q', 'z', 't', '105', 'q']

A: a, c, e, h, i, j, l, n, q, r, t, u, v, z
****
Q: ['3623', 'z', 'g', '9065', 'p', 's', 'd', 'w', 'd', '651', '9823', '1069', '485', 'r', '6801', 'd', '263', '8675', '8025', '9073', 'n', 'x', 's', 'o', 'e', '1369', 't', 'u', '7299', 'o', '191', '8115', 'l', '4149', 'z', '3307', 'j', 'z', 'q', '3671', 'g', '835']

A:
d, e, g, j, l, n, o, p, q, r, s, t, u, w, x, z
****