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: ['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']

A: c, j, q, v
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Q: ['4397', '2685', '9539', '4343', '6697', '7693', 'g', 'c', '3587', '4691', 'j', '8931', '7397', '2103', '3431', 'u', 'l', 's', 'v', 'q', 'd', '1289', 'h', '1695', 'h', 'j', 'e', '1225', 'e', '7893', 'o', 'i', '3351']

A: c, d, e, g, h, i, j, l, o, q, s, u, v
****
Q: ['1143', 'v', '4819', '8137', 'v', 'n', 'a', 'e', 'q', '2241', 'z', '4913', 'n', '9399', 'k', '5761', 'j', '5601', 'p', '869', 'q', 'r', '8979', 'e', 'i', 'e', '4827', '5661', 'w', 'u', 'g', 'b', 'b', '3647', '883', 'v', '4193']

A:
a, b, e, g, i, j, k, n, p, q, r, u, v, w, z
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