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: ['g', 'x', 'l', 'e', 'd', '1345', '1763', 'm', 'c', '2057', 's', 'a', '4127', 'y', 'h', '8581', 'o', '9203', '4761', 'd', 'u', 'n']

A: a, c, d, e, g, h, l, m, n, o, s, u, x, y
****
Q: ['o', 'v', 'w', '7939', '571', '395', '3707', 'm', 'd', 'u', 'o', 'r', '4211', '9645', '8731', '2441', 'y', '8147', '8809', 'e', 'b', '6835', 'i', '2083', 't', '3481', 'f', 'f', '5559', '3601', 'e', '5637', '5185', 't', '6777', '3419', '8637', 'p', 's', 'o', 'x']

A: b, d, e, f, i, m, o, p, r, s, t, u, v, w, x, y
****
Q: ['m', '4307', 'g', 'r', 'q', '203', '6019', 'f', '2119', 't', 'g', 'y', 't', '4051', '1905']

A:
f, g, m, q, r, t, y
****