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: ['d', 'o', '7643', '9065']

A: d, o
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Q: ['887', 'p', '3819', '2727', '1407', 'b', 'n', '737', 'd', 'w', 'q', '6877']

A: b, d, n, p, q, w
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Q: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']

A:
a, f, q, v, x
****