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

Answer: c, j, q, v


Question: ['2047', '4403', 'g', '3017', '1627', 'v', 'r', '2237', '5513', 'o', 'v', '7229', '9801', 'j', '443', 'z', 'q', 'y', '7447', '1659', '3411', '55', '5153', '9921', '2195', '1075', '8187', 'p', 'x', 'h', 'y', 't', 'a', 'r', 'f']

Answer: a, f, g, h, j, o, p, q, r, t, v, x, y, z


Question: ['y', '5985', '9315', 'r', '4333', '8661', '3789', 'x', '1519', '5099', 'w', 'e', 'a', '4435', 'q', '7783', 'n', 'q', '8497', '757', '1865', 'e', 'o', '6705', 's', 'a']

Answer:
a, e, n, o, q, r, s, w, x, y