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: ['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']

A: b, e, f, g, j, k, l, o, r, t, u, v, z
****
Q: ['o', 'z', 'h', '3965', 'n', '3009', '173', '997', '3987', '5799', '2331', 'p', 'x', '897', '8213', '451', 'u', 't', 't', '9917', '4501', 't', 'c', 'i', 'w', 'w', 'u', '2977', 't', 'b', '4161', '9281', 'w', 'f', '3137', '5745', 'e', '673', '6363', 'h', 'q', 'x', 'm', '9505']

A: b, c, e, f, h, i, m, n, o, p, q, t, u, w, x, z
****
Q: ['7009', '3933', 'l', '7601', '5663', '7471', '9665', 'q', '6575', '4643', 'k', '1855', 'g', 'l', 'l', '5723', 'p', '5323', '1013', 'k', '4353', 'x']

A:
g, k, l, p, q, x
****
