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.
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Question: ['e', 'z', '5199', 'x']

Answer: e, x, z


Question: ['2409', 'q', 'w', 'e', 'x', '4737', 'w']

Answer: e, q, w, x


Question: ['h', '2091', 'g', '4119']

Answer:
g, h