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: ['6463', '871', '5781', '283', '9653', 'f', '9661', '3365', '2889', '5499']

A: f
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Q: ['6627', '8037', 'q', 'e', 'j', 'p', '9613', '9317', 'm', 'm', '5345', 'f', '8105', '5665', '4175', '4793', '3707', 'i', 'b', '6745', '747', '8329', '1481', 'b', '8949', 'n', '4803', '1359', '3533', 'f', '543', '3003', '6943']

A: b, e, f, i, j, m, n, p, q
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Q: ['a', '7331', 'w', 'o', 'i', '8861', '3061', 'm', '2919', 'd', 'b']

A:
a, b, d, i, m, o, w
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