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: ['9013', 'e', 'm', 'p', 'k', '161', 'k']

A: e, k, m, p
****
Q: ['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']

A: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z
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Q: ['o', 'x', '5881', '5743', '5499', 'h', '2741', 'n', '5457', '2957', '8837', 'f', '1387', '1389', 'p', '6675', 's', '1349']

A:
f, h, n, o, p, s, x
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