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: ['h', 'b', '9601', 'h', 'h', 'h', '8099', '8265', 'i', 'd', '8791', 'p', '8059', '4309', '501', '2581', '9837', '157', '4785', '5925', 'q', '8491', '4779', 'r', 'l', 'k', '3679', 'v', 'g', 'g', '9731', '1909', '9783', 'f', '4293', '5009', 'o', '3057', '3157', 'c', '5587', 'b', 'f', 'd', 'k']

Answer: b, c, d, f, g, h, i, k, l, o, p, q, r, v


Question: ['i', 'x', 'n', 'w', '8915', 'd', 'd', 'd', '6025', '7861']

Answer: d, i, n, w, x


Question: ['6215', 'p', 'l', 'l', '5795', '6191', 'l', 'n', 'j', 'f', '9943', 'b', '5957']

Answer:
b, f, j, l, n, p