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]: ['x', 'b', '1467', 'y', '2101', 'y', 'm', '2745', 'z', '429', '7523', 'e', 'f']
[A]: b, e, f, m, x, y, z


[Q]: ['2103', '7937', 'v', '7641', '6609', '269', '4463', '4333', 'c', '8407', '4883', '6283', 'a', '8643', '3365', '1929', 'v', 'o', '2107', '7453', '9157', '5581', '5187', 'f', 'k', '8227', '6295', 'b', 'y', '4995', '1187', 'k', 'n', 'p', 'z', '8165', 'n', '7345', 'l']
[A]: a, b, c, f, k, l, n, o, p, v, y, z


[Q]: ['8843', '2249', 'i', '8821', 'a', 'r', 'b', '6881', 'b', '7695', '4625', 'c', 's', 't', '8687', '3951', '9545', 'n', '9879', 'm', 'l', '4563', '9141', '6329', '7617', '6717', '1257', 'u', 'u']
[A]:
a, b, c, i, l, m, n, r, s, t, u