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: ['5957', 'd', 'i', 'b', 'e', '5565', 'c', 'i', '2919']

A: b, c, d, e, i
****
Q: ['2247', 'w', 'h', '4675', '6153', 'f', '6029', 'o', 'd', 'j', 'z', 'y', 'i', '6899', '3917', 'u', '6447', '6405', 'a', '1705', '8585', 'v', 'f', 'r']

A: a, d, f, h, i, j, o, r, u, v, w, y, z
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Q: ['683', '7331', '8261', 'h', 'f', 'u', 'q', 's', 'z', '2797', 'y', '5429', 'p', 'v', 'f', '147']

A:
f, h, p, q, s, u, v, y, z
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