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: ['5011', 'l', '925', 'e', 'b', '3077', 'm', '4541', '781']

A: b, e, l, m
****
Q: ['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']

A: e, f, i, j, r, s, u, v, w
****
Q: ['3723', '5021', 'l', '2857', '599', '4253', '9063', '9911', 'v', '3625', 'w', 'i', 'o', '5755', 'i', 'x', '9183', '9909', 'r', '223', 'z', 'w', 'v', '383']

A:
i, l, o, r, v, w, x, z
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