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: ['k', 'c', 'i']

A: c, i, k
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Q: ['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']

A: d, f, j, r, t, z
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Q: ['j', 'z', '5517', 'a', '5591', 'r', '1625', 'j', 't']

A:
a, j, r, t, z
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