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: ['3307', 'r', '2665', '3453', 'f', 'd', 'v', '3801', '3153', '3137', 'y', 'i', '9681', 'k', '9253', 'y', 'i', '8631', '2375', '5131', 'r', 'z', '8645', '595', 's', '6749', '2665', '709', '8203']

Answer: d, f, i, k, r, s, v, y, z


Question: ['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']

Answer: a, c, e, g, j, l, n, q, s, x


Question: ['k', '9871', 'q', '611', 'p', 'q', 'n', '3121', 'g', '4093', 'q', '5791', 'q', '3295', '4249', '1501', '9593', '6245', 'x', '2925', '6963', 's', 'p', 'd', '9689', 'z', 'z', '6927', '7459', 'n', 'd', 'g']

Answer:
d, g, k, n, p, q, s, x, z