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: ['m', '5005', 'y', 'h', 'w', '3609', 'p', '2539', '3307', 'p']

Answer: h, m, p, w, y


Question: ['2775', '7507', 'c', '4417', '3449', 'y', 'z', 'e', 'f', '9515', '8555', '7269', '8353', '4239', '4347', '4479', '8645', '9925', 'o', 'h', 'o', '8641', 'y', '3251', '1191', 't', 'x', 'z', '7203', 'b', 'b', '7545', '7283', 'z', 'y', '8127', 'x', 'l', '6251', 'y']

Answer: b, c, e, f, h, l, o, t, x, y, z


Question: ['3623', 'z', 'g', '9065', 'p', 's', 'd', 'w', 'd', '651', '9823', '1069', '485', 'r', '6801', 'd', '263', '8675', '8025', '9073', 'n', 'x', 's', 'o', 'e', '1369', 't', 'u', '7299', 'o', '191', '8115', 'l', '4149', 'z', '3307', 'j', 'z', 'q', '3671', 'g', '835']

Answer:
d, e, g, j, l, n, o, p, q, r, s, t, u, w, x, z