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', 'p', 'q', '5319', 'w', '4887', '6695', 't', '7711', 'l', '7597', 's', 'n', '1461', 'e', '9045', '1307', 'j']

A: d, e, j, l, n, p, q, s, t, w
****
Q: ['8489', 'h']

A: h
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Q: ['1123', '7815', '6449', 'c', '5581', 't', '4037', '6151', 'z', '5891', '6781', 'g', '3641', '4747', '109', 'c']

A:
c, g, t, z
****